| 单词 | testis |
| 例句 | When young roosters were fed DDT, the testes made only 18 per cent of their normal growth; combs and wattles, dependent for their development upon the testicular hormone, were only a third the normal size. Silent Spring 1962-09-27T00:00:00Z In one of the robins the concentration of DDT in the testes was heavier than in any other part of the body. Silent Spring 1962-09-27T00:00:00Z Probably as an effect of such storage in the sex organs, atrophy of the testes has been observed in experimental mammals. Silent Spring 1962-09-27T00:00:00Z I read about hyperadrenocorticism and feminizing testes and something called cryptorchidism, which applied to me. Middlesex: A Novel 2002-06-05T00:00:00Z The “gonadal tissue,” as he referred to my undescended testes, often became cancerous in later years. Middlesex: A Novel 2002-06-05T00:00:00Z I know it was hard because Mom has chopped off your balls and baked them in a testes casserole, but thank you for trying. Ask the Passengers 2012-10-23T00:00:00Z “Ram’s testicles” is a Roman pun—testes refers to the witnesses in the case—while the cup suggests poison and the tablets a will. Words Like Loaded Pistols 2011-10-20T00:00:00Z It was if he was trying to kick God in both his testes, one nut per foot. Stagediving, putting the danger back into live music 2013-07-12T12:00:00Z Maybe it's somebody who has external genitals that are female, but internally instead of ovaries, there's actually internal testes. "They're tired of explaining their own bodies": Intersex folks counter right-wing hate and shaming 2023-07-06T04:00:00Z The leading cause of male infertility is a complaint called varicocele, which is a knot of varicose veins in the testes. The male infertility crisis: ‘My failure at fatherhood ate away at my very being’ 2018-08-12T04:00:00Z And yet he’s not at all pleased when, thanks to testosterone blockers, his testes shrink and his breasts begin to grow. Three Sharply Observed Books Showcase the Enduring Appeal of Memoirs About Dealing With Disease 2021-08-02T04:00:00Z It creates an engorgement of blood that heats up the testes as much as four degrees, which can cause significant damage to sperm. The male infertility crisis: ‘My failure at fatherhood ate away at my very being’ 2018-08-12T04:00:00Z The images show either testes or ovaries, and if the fish is female, whether she is immature, close to maturation, or ready for harvest. How to make caviar sustainable 2018-05-14T04:00:00Z By removing my testes in infancy and forcing my body into hormone withdrawal, that was leeching calcium from my bones. "Intersex is a beautiful thing": Despite having surgery forced upon her, this activist found healing 2023-09-26T04:00:00Z The report builds on three decades of research that have sought to tackle the question of whether a man’s choice of underwear has an impact on how well his testes function. Wearing boxer shorts boosts sperm count, scientists say 2018-08-08T04:00:00Z The doctors told my parents that I could get testicular cancer and they recommended removing my testes. "Intersex is a beautiful thing": Despite having surgery forced upon her, this activist found healing 2023-09-26T04:00:00Z “The postmortem report states that the testes were not examined,” he says. How I came face to face with my dead father’s brain 2017-06-03T04:00:00Z It remains to be seen whether it will make human testes shrink and whether men would mind if it does. Pills, thrills and polymer gels: what's the future for male contraception? 2015-07-06T04:00:00Z Another pathologist will later explain that the testes might have been omitted from a full autopsy because they’re a bit of a “faff”. How I came face to face with my dead father’s brain 2017-06-03T04:00:00Z There is now a fair consensus that tight underpants may lead to “scrotal heating” which harms the Sertoli cells that make sperm in the testes. Wearing boxer shorts boosts sperm count, scientists say 2018-08-08T04:00:00Z Instead of having a uterus and ovaries on the inside, I was born with internal testes. "Intersex is a beautiful thing": Despite having surgery forced upon her, this activist found healing 2023-09-26T04:00:00Z “One big step for man… capturing the moment when a testis forms”, a caption reads. 'It gives you hope': the fight to save the fertility of children with cancer 2018-12-15T05:00:00Z Creating such a singer was as nasty as it sounds: a warm bath for the choirboy and then either snipping the blood supply to the testes or using special secateurs to whip them off altogether. Bath celebrates the life of the bedhopping singing star of the 1700s 2010-04-12T06:00:00Z “Testes, testes, one, two, three!” a voice rasped over the sound system in a cheeky Southern drawl. Lady Bunny Is Still the Shadiest Queen Around 2018-09-29T04:00:00Z The reason that I look the way I do, that I present so femme outwardly is because despite the fact I was born with testes, my body does not absorb testosterone. "Intersex is a beautiful thing": Despite having surgery forced upon her, this activist found healing 2023-09-26T04:00:00Z “I wondered why his testes were not examined in the autopsy,” I tell the professor. How I came face to face with my dead father’s brain 2017-06-03T04:00:00Z My testes would've produced testosterone, but my body would have urinated some of that out, and the rest would have converted to estrogen. "Intersex is a beautiful thing": Despite having surgery forced upon her, this activist found healing 2023-09-26T04:00:00Z As it turns out, nothing else in “Tracks” matches the dramatic pow of a camel being relieved of his testes. Mia Wasikowska Plays Robyn Davidson in ‘Tracks’ 2014-09-18T04:00:00Z Eighty men in Manchester and Edinburgh will be asked to use a daily gel containing hormones that “send the testes to sleep”, meaning the sperm count drops to zero. Male contraceptive gel: couples being recruited for pioneering UK trial 2019-01-31T05:00:00Z “We were definitely advised that surgery was the best option and that Rae has testes in their lower abdomen,” Sarah says. Are hasty operations on intersex children becoming a thing of the past? 2020-07-14T04:00:00Z All three had procedures as children, to remove or add testes, surgeries they wish had not been done. For a Documentary on Intersex Lives, a Director Champions the Power of Activism 2023-06-30T04:00:00Z “I later found out they were referring to my undescended testes. I remember crying to my friend because my entire vision of the future had just changed.” Are hasty operations on intersex children becoming a thing of the past? 2020-07-14T04:00:00Z In both animals, they also confirmed the presence of stem-cell-derived cells in the testes and in cells that eventually develop into sperm cells. First live birth of a chimeric monkey using embryonic stem cell lines 2023-11-09T05:00:00Z Typically, mice with XY sex chromosomes develop testes, and mice with XX chromosomes develop ovaries. Female sex determining gene identified in mice 2023-11-02T04:00:00Z Do they cause a significant increase in temperature in the testes? Mobile phone use may affect semen quality 2023-11-01T04:00:00Z Her team also surveyed 1,000 native fish taken from the Uruguay River, and found that male fish caught downstream from the pulp mill had smaller testes. Does the paper industry need to cut its water usage? 2023-10-22T04:00:00Z Other attempts were more bizarre and grotesque: in the 1920s a surgeon in France transplanted chimpanzee testes into elderly men in an attempt to “rejuvenate” the men. No One Should Die Waiting for an Organ Transplant. These Doctors Want to Ensure That Doesn’t Happen 2023-10-19T04:00:00Z Usually in these cases, a small portion of the testes is surgically removed, and taken to a lab, where an embryologist can manually search for healthy sperm. How AI may be a powerful tool in treating male infertility 2023-09-06T04:00:00Z Whether early gonads become ovaries or testes is due to cells either becoming Sertoli cells for testes, or pregranulosa cells for ovaries. Female sex determining gene identified in mice 2023-11-02T04:00:00Z A vasectomy blocks the vas deferens, the tubes that are the highway for sperm between the testes and penis. A Florida doctor did a vasectomy on the wrong side, a state complaint says 2023-07-02T04:00:00Z Wall was instead labeled female on the document and, at the age of 13, after his mother was inaccurately warned of a cancerous threat, his testes were removed. In ‘Every Body,’ a galvanizing moment — and celebration — for the intersex community 2023-06-22T04:00:00Z Zebrafish that made telomerase only in the gut had less DNA damage in their kidney marrow, which produces blood and immune cells; even cells in the males’ testes retained the ability to proliferate. Scientists prevent signs of aging in zebrafish by targeting the gut 2023-05-18T04:00:00Z Sperm are produced in the testes and are transported through the reproductive ducts. Fundamentals of Biology 2015-01-01T00:00:00Z This decision results from the coordinated activity of a set of genes, such as the Sry gene on the Y chromosome which has a short window of time to drive testes development. Female sex determining gene identified in mice 2023-11-02T04:00:00Z This structure lies along the top and posterior of the testes and is the site of sperm maturation. Concepts of Biology 2013-04-25T00:00:00Z The male squirrels appeared normal — their testes were nice and big — but their internal plumbing wasn’t online yet. Perspective | Squirrels 9,000 miles apart hint at the effects of climate change 2023-04-10T04:00:00Z On average, treated fish lived 40% longer than those that lacked telomerase entirely and remained healthier during their old age with more cell proliferation in the kidneys and testes. Scientists prevent signs of aging in zebrafish by targeting the gut 2023-05-18T04:00:00Z In many dioecious species, males are short-lived and smaller with no digestive system and a single testis. Fundamentals of Biology 2015-01-01T00:00:00Z The production of SRY never reached the level needed to trigger testes development. Female sex determining gene identified in mice 2023-11-02T04:00:00Z LH also enters the testes and stimulates the interstitial cells of Leydig, located in between the walls of the seminiferous tubules, to make and release testosterone into the testes and the blood. Concepts of Biology 2013-04-25T00:00:00Z Those born with DSD, also known as intersex, are often raised female after being born with ambiguous genitalia, but may have undescended male testes and produce higher levels of testosterone as they mature. World Athletics bars post-pubescent biological males from female track-and-field contests 2023-03-23T04:00:00Z In one condition, testes develop internally but external genitals and breasts appear female. States’ push to define sex decried as erasing trans people 2023-02-15T05:00:00Z The male reproductive system includes the two testes within the scrotum as well as the epididymis which wraps around each testis. Fundamentals of Biology 2015-01-01T00:00:00Z They must undergo radical physical changes as they undertake their journey from the testes through the complex female reproductive tract. The scientist who discovered sperm was so grossed out he hoped his findings would be repressed 2023-01-02T05:00:00Z The XXY chromosome complement, corresponding to one type of Klinefelter syndrome, corresponds to male individuals with small testes, enlarged breasts, and reduced body hair. Concepts of Biology 2013-04-25T00:00:00Z This region of the Y chromosome contains instructions for developing testes, and the changes create animals with XX chromosomes and testes or XY chromosomes and ovaries. Scientists Created Male and Female Cells from a Single Person 2022-12-21T05:00:00Z The females even have a penis, complete with testes, capable of erections. Perspective | Narwhals, ruffs and other animals that defy gender stereotypes 2022-11-14T05:00:00Z The ovaries and testes are located in the pelvic cavity. Fundamentals of Biology 2015-01-01T00:00:00Z “It’s an operation, and there are no invasive procedures without complications,” he said about surgical retrieval of sperm from the testes. A New Procedure Could Expand Reproductive Choices for Transgender Women 2022-10-21T04:00:00Z Telomerase reactivation in these mice caused extension of telomeres, reduced DNA damage, reversed neurodegeneration, and improved functioning of the testes, spleen, and intestines. Concepts of Biology 2013-04-25T00:00:00Z The progestin suppresses two pituitary hormones that control the testes, the organs that produce sperm. Male Birth Control Is in Development, but Barriers Still Stand in the Way 2022-10-13T04:00:00Z A change in hormone levels makes their ovaries transform into testes, allowing them to produce more offspring over their lifetime. Perspective | Narwhals, ruffs and other animals that defy gender stereotypes 2022-11-14T05:00:00Z Illustration shows a cross section of the penis and testes. Fundamentals of Biology 2015-01-01T00:00:00Z The process can be painful and can damage the testes. A New Procedure Could Expand Reproductive Choices for Transgender Women 2022-10-21T04:00:00Z In land mammals, including humans, the pair of testes must be suspended outside the body so the environment of the sperm is about 2 °C lower than body temperature to produce viable sperm. Concepts of Biology 2013-04-25T00:00:00Z While the testes require high concentrations of testosterone to make sperm, testosterone is typically included in hormonal methods to ensure that there is an adequate level of the hormone for other bodily functions. Male Birth Control Is in Development, but Barriers Still Stand in the Way 2022-10-13T04:00:00Z At age 13, Wall underwent a surgery to remove his internal testes, which at the time were thought to carry a risk of cancer. How Medicine's Fixation on the Sex Binary Harms Intersex People 2022-08-24T04:00:00Z The testes, located immediately behind the penis, are covered by the scrotum. Fundamentals of Biology 2015-01-01T00:00:00Z Haploid cells, containing a single copy of each homologous chromosome, are found only within an organism’’s reproductive structures, such as the ovaries and testes. Biology for AP Courses 2022-06-09T00:00:00Z The prostate gland is located in the testes. Concepts of Biology 2013-04-25T00:00:00Z In male fetuses, the testes descend into the scrotum near the end of this period. Anatomy and Physiology 2013-06-19T00:00:00Z With no need to out-compete the inseminations of other males, gorillas have small testes relative to their enormous bodies. A microscopic arms race is happening between sperm 2022-06-19T04:00:00Z I had healthy testes that I was not allowed to keep, because we all live according to the Adam and Eve fairy story of humanity — not science and the truth of complex biology. Commentary: My life as an intersex comedian living every letter in the queer alphabet 2022-06-17T04:00:00Z The XXY genotype, corresponding to one type of Klinefelter syndrome, corresponds to phenotypically male individuals with small testes, enlarged breasts, and reduced body hair. Biology for AP Courses 2022-06-09T00:00:00Z The gonads—the male testes and female ovaries—produce steroid hormones. Concepts of Biology 2013-04-25T00:00:00Z FSH helps stimulate the maturation of eggs in the ovaries and sperm in the testes. Anatomy and Physiology 2013-06-19T00:00:00Z Relative to their body sizes, men's testes are not typically as large as those of chimps and bonobos and they're not as small as those of gorillas. A microscopic arms race is happening between sperm 2022-06-19T04:00:00Z Having my “ovaries”/ testes removed was a very scary operation. Commentary: My life as an intersex comedian living every letter in the queer alphabet 2022-06-17T04:00:00Z These hormones affect nearly every cell in the body except for the adult brain, uterus, testes, blood cells, and spleen. Biology for AP Courses 2022-06-09T00:00:00Z If the testes do not descend through the abdominal cavity during fetal development, the individual has reduced fertility. Concepts of Biology 2013-04-25T00:00:00Z In addition, the testes produce the peptide hormone inhibin, which inhibits the secretion of FSH from the anterior pituitary gland. Anatomy and Physiology 2013-06-19T00:00:00Z Certainly, there has never been a better time for people with testes to step up and take some responsibility for contraception. Opinion | We need a male contraceptive pill. But good luck getting guys to take it. 2022-04-21T04:00:00Z “It came out of decades of the unfailing belief that the ovary was different from the testis.” Opinion | Ovaries Are Prone to ‘Exhaustion’ and ‘Fatigue.’ Or Are They? 2022-03-29T04:00:00Z Sperm are made in testes and then travel through coiled tubes to the epididymis for storage. Biology for AP Courses 2022-06-09T00:00:00Z The testes are a pair of male gonads that produce sperm and reproductive hormones. Concepts of Biology 2013-04-25T00:00:00Z The female ovaries and the male testes are a part of which body system? Anatomy and Physiology 2013-06-19T00:00:00Z The key with YCT529 is that it's not a hormonal contraceptive, meaning it doesn't target testosterone, which is the male sex hormone made in the testes. Male contraceptive pill could be ready for humans in five years 2022-03-24T04:00:00Z The team plans to isolate spermatogonial stem cells from the thawed tissue and then inject them, unedited, into the owner’s testis to see whether that produces viable sperm. As creator of ‘CRISPR babies’ nears release from prison, where does embryo editing stand? 2022-03-21T04:00:00Z The testes are a pair of male reproductive organs that produce sperm and some reproductive hormones. Biology for AP Courses 2022-06-09T00:00:00Z The vas deferens carries sperm from the testes to the seminal vesicles. Concepts of Biology 2013-04-25T00:00:00Z The hypothalamus, thymus, heart, kidneys, stomach, small intestine, liver, skin, female ovaries, and male testes are other organs that contain cells with endocrine function. Anatomy and Physiology 2013-06-19T00:00:00Z “So, overall, it seems that no active virus is present in the testes/prostate. The same is true for vaginal excretions.” When Is It Safe to Have Sex after COVID? 2022-03-09T05:00:00Z I went down to the bottom of the image, which was almost cut off, and the testes were brightly lit up. The coronavirus invades cells in the penis and testicles of monkeys, researchers discover. 2022-03-01T05:00:00Z In land mammals, the pair of testes must be suspended outside the body at about 2° C lower than body temperature to produce viable sperm. Biology for AP Courses 2022-06-09T00:00:00Z Further mouse research suggested that QACs can accumulate inside the brain, liver and testes. Immigrants in U.S. Detention Exposed to Hazardous Disinfectants Every Day 2021-09-17T04:00:00Z LH stimulates production of testosterone by the male testes. Anatomy and Physiology 2013-06-19T00:00:00Z Sometimes they’re not just threats: I’m thinking of a scene in another festival highlight, Jane Campion’s 1920s frontier saga “The Power of the Dog,” in which Benedict Cumberbatch graphically divests a bull of its testes. Who says Netflix movies are bad? Streamer packs a punch at Telluride Film Festival 2021-09-07T04:00:00Z “The Zika virus goes to the testes and infects the testes, and Ebola can also do that.” The coronavirus invades cells in the penis and testicles of monkeys, researchers discover. 2022-03-01T05:00:00Z Infertility can occur in land mammals when the testes do not descend through the abdominal cavity during fetal development. Biology for AP Courses 2022-06-09T00:00:00Z A biopsy study of testis tissue from six people who died of COVID-19 showed the virus still lingering in a sample from one of the patients and decreased sperm counts in another three. COVID Vaccines Show No Signs of Harming Fertility or Sexual Function 2021-08-24T04:00:00Z For this reason, cells that produce large quantities of such hormones, such as those of the female ovaries and male testes, contain large amounts of smooth ER. Anatomy and Physiology 2013-06-19T00:00:00Z “When you throw testes into the mix or certain mechanical legs, it is altering the design.” Track and Field Aimed for Inclusion. Instead It Sidelined Star Athletes. 2021-07-30T04:00:00Z One example: Investigators studying testes tissues from six patients who died from the 2006 SARS-CoV virus found all of them had widespread cell destruction, with few to no sperm. COVID-19 could cause male infertility and sexual dysfunction — but vaccines do not 2021-07-28T04:00:00Z Sperm mature in seminiferous tubules that are coiled inside the testes, as illustrated in Figure 34.10. Biology for AP Courses 2022-06-09T00:00:00Z The Guardian, citing IOC guidelines, reported that athletes who transition from male to female are allowed to compete in events without surgically removing their testes. Laurel Hubbard is the first transgender athlete to compete in Olympics 2021-06-21T04:00:00Z In addition to aging, ED is associated with diabetes, vascular disease, psychiatric disorders, prostate disorders, the use of some drugs such as certain antidepressants, and problems with the testes resulting in low testosterone concentrations. Anatomy and Physiology 2013-06-19T00:00:00Z It takes around two months for stem cells in the testes to develop into new sperm, meaning that any single count is merely a snapshot of an evolving landscape. The Sperm-Count ‘Crisis’ Doesn’t Add Up 2021-06-04T04:00:00Z Still, for men who have had COVID-19 and then experienced testicular pain, it is reasonable to consider that the virus has invaded testes tissue. COVID-19 could cause male infertility and sexual dysfunction — but vaccines do not 2021-07-28T04:00:00Z This structure resembles a comma and lies along the top and posterior portion of the testes; it is the site of sperm maturation. Biology for AP Courses 2022-06-09T00:00:00Z For a study published in Genome Biology, Mehta and his colleagues analyzed gene expression in the brain, eye, heart, kidney, muscle tissue and testis of five cichlid species from East African rivers and lakes. Evolution’s Favorite Fish Diversify through ‘Noncoding’ Genes 2021-05-18T04:00:00Z The alternate term for Leydig cells, interstitial cells, reflects their location between the seminiferous tubules in the testes. Anatomy and Physiology 2013-06-19T00:00:00Z Male scientists have long waxed poetic on the contents of their testes. The Sperm-Count ‘Crisis’ Doesn’t Add Up 2021-06-04T04:00:00Z And then when the testosterone is present made by the fetal testes, then the male genitals starts to develop in the male typical way that we expect. How plastics are making us infertile — and could even lead to human extinction 2021-04-04T04:00:00Z FSH enters the testes and stimulates the Sertoli cells to begin facilitating spermatogenesis using negative feedback, as illustrated in Figure 34.16. Biology for AP Courses 2022-06-09T00:00:00Z But certain parts of the body, including the eye, the central nervous system and the testes are so-called privileged sites, beyond the reach of the immune system. Ebola Survivor Infected Years Ago May Have Started New Outbreak 2021-03-12T05:00:00Z The regulation of Leydig cell production of testosterone begins outside of the testes. Anatomy and Physiology 2013-06-19T00:00:00Z When infant mice were exposed for just a few days to endocrine disrupting chemicals, their testes as adults produced fewer sperm, and this incapacity was transmitted to their offspring. Opinion | What Are Sperm Telling Us? 2021-02-20T05:00:00Z The study used testes weight as a measure of male fertility. Ocean pollutants 'have negative effect on male fertility' 2021-01-11T05:00:00Z LH also enters the testes and stimulates the interstitial cells of Leydig to make and release testosterone into the testes and the blood. Biology for AP Courses 2022-06-09T00:00:00Z They were removed before the debate following negative testes for Trump - who spent three days in hospital after testing positive earlier this month - and Biden. Presidential debate: Second Trump v Biden debate in pictures 2020-10-23T04:00:00Z In men, LH binds to receptors on Leydig cells in the testes and upregulates the production of testosterone. Anatomy and Physiology 2013-06-19T00:00:00Z The male animals were then born sterile, but began producing sperm after researchers transplanted stem cells from donor animals into their testes. Scientists create gene-edited animals as 'surrogate sires' to boost food production 2020-09-14T04:00:00Z Cryptorchidism is a condition in which one or both testes fail to descend from the abdomen into the scrotum. Physical deformities linked to inbreeding discovered among cougars in the Santa Monica Mountains 2020-09-10T04:00:00Z In the male, FSH and LH stimulate Sertoli cells and interstitial cells of Leydig in the testes to facilitate sperm production. Biology for AP Courses 2022-06-09T00:00:00Z The disease can cause blockages in the vas deferens that deliver sperm out of the testes. Living, breathing proof 2020-07-28T04:00:00Z In the testis, LH binds to LH receptors on Leydig cells and stimulates the release of testosterone. Anatomy and Physiology 2013-06-19T00:00:00Z The position of the testes is a reflex controlled by the cremaster muscle, which brings them closer to the body in colder temperatures to maintain the warmth needed for sperm production. ‘Seinfeld,’ science and yada, yada, yada 2020-06-12T04:00:00Z ACE2 is found not only in the lungs, but also the heart, kidneys and the tissues lining blood vessels, and there are particularly high levels in the testes. Men have high levels of enzyme key to COVID-19 infection, study finds 2020-05-11T04:00:00Z Complete reproductive systems are formed in insects, with eggs maturing in the testes and sperm maturing in the ovaries. Biology for AP Courses 2022-06-09T00:00:00Z A male friend was unable to father children because mumps infected his testes and left him sterile. Coronavirus as a Reminder of the Urgency of Getting Your Vaccines 2020-04-27T04:00:00Z The SRY gene actively recruits other genes that begin to develop the testes, and suppresses genes that are important in female development. Anatomy and Physiology 2013-06-19T00:00:00Z The younger Shastri said that if the coronavirus is found hiding in the testes, that might mean the virus can be sexually transmitted. Do testicles make men more vulnerable to the coronavirus? 2020-04-18T04:00:00Z Testosterone, which is produced in abundance by male testes, has been shown to tamp down inflammation. All across the United States, the coronavirus is killing more men than women, data show 2020-04-04T04:00:00Z Complete reproductive systems are formed in insects, with eggs maturing in the ovaries and sperm maturing in the testes. Biology for AP Courses 2022-06-09T00:00:00Z The more adventurous may insist on the male carp’s testes. It's the national dish that brought down a dictator. And it's delicious 2020-03-03T05:00:00Z Soon after the formation of the testis, the Leydig cells begin to secrete testosterone. Anatomy and Physiology 2013-06-19T00:00:00Z While women offer the coronavirus plenty of opportunities to enter their cells, men’s testes may give the virus an extra point of entry. Do testicles make men more vulnerable to the coronavirus? 2020-04-18T04:00:00Z A study of nearly 200 Iberian red deer stags measured the size and complexity of the animals’ antlers and found that bigger and more elaborate racks correlated with both bigger testes and faster-swimming sperm. The Weapons of Sexual Rivalry 2019-12-24T05:00:00Z Complete reproductive systems are formed in insects, with eggs maturing in the ovaries and sperm maturing in the testes. Biology for AP Courses 2022-06-09T00:00:00Z During puberty, a surge of testosterone in young men typically leads to enlargement of the muscles, penis, testes and prostate gland, and the emergence of secondary sex characteristics. Testosterone book sifts truths from tall tales 2019-10-21T04:00:00Z In boys, the growth of the testes is typically the first physical sign of the beginning of puberty, which is followed by growth and pigmentation of the scrotum and growth of the penis. Anatomy and Physiology 2013-06-19T00:00:00Z But she said “it’s worth pointing out to people who have forgotten that ACE2 is in the testes, and could be a player.” Do testicles make men more vulnerable to the coronavirus? 2020-04-18T04:00:00Z The study, which was published Thursday in the journal Cell, relied on samples—testis, liver, and brain—from two wild koalas that had KoRV. What a Koala Virus Tells Us About the Human Genome 2019-10-14T04:00:00Z Spermatogenesis is the process of formation of four sperm in the testes in males. Biology for AP Courses 2022-06-09T00:00:00Z They have focused on the sncRNAs in sperm, which may be especially vulnerable to stress during the weeks that newly formed sperm spend maturing in a twisting tube on top of the testes. Parents’ emotional trauma may change their children’s biology. Studies in mice show how 2019-07-18T04:00:00Z Interplay between the testes and the endocrine system precisely control the production of testosterone with a negative feedback loop. Anatomy and Physiology 2013-06-19T00:00:00Z The progesterone switches off sperm production in the testes and the testosterone compensates for the drop in testosterone that this causes. 'We're using a male contraceptive gel' 2019-06-25T04:00:00Z Marisa also explains that unlike what the name suggests, a “chemical castration” is reversible, leaves the testes intact and doesn’t prevent a man from reproducing. Analysis | The Health 202: Blue states move to expand abortion access in rebuttal to bans in Republican-led states 2019-06-12T04:00:00Z Spermatogenesis is the process of formation of four sperm in the testes in males. Biology for AP Courses 2022-06-09T00:00:00Z Anabolic steroids fool the brain's pituitary gland into thinking the testes are going into overdrive. Male beauty quest 'damages fertility' 2019-05-27T04:00:00Z Where are the testes located for most of gestational time? Anatomy and Physiology 2013-06-19T00:00:00Z He points out that poor sperm quality is associated with an increased risk of testicular cancer and also a history of congenital reproductive defects, including undescended testes. Sperm counts are on the decline – could plastics be to blame? 2019-05-24T04:00:00Z Harrington writes of schizophrenia treatments that included “removing teeth, appendixes, ovaries, testes, colons, and more.” The Troubled History of Psychiatry 2019-05-20T04:00:00Z Spermatogenesis is the process of formation of four sperm in the testes in males. Biology for AP Courses 2022-06-09T00:00:00Z The doctor focused on the tender, swollen testes. The Boy Was Feverish, With a Swollen Testicle. What Could He Possibly Have? 2019-04-04T04:00:00Z Using what you know about negative feedback, describe what would happen to testosterone production in the testis if a male takes large amounts of synthetic testosterone. Anatomy and Physiology 2013-06-19T00:00:00Z Lea says he focused on two compounds that “consistently popped up” in his analysis of dog food, sperm and testes tissues from routine neutering procedures. Sperm counts are on the decline – could plastics be to blame? 2019-05-24T04:00:00Z “All we have shown so far is that it shuts down the hormones that control the function of the testes.” Hopes rise for male contraceptive pill breakthrough 2019-03-25T04:00:00Z Spermatogenesis is the process of formation of one sperm in the testes in males, while the process of formation of one ovum in the ovaries in females is called oogenesis. Biology for AP Courses 2022-06-09T00:00:00Z Writing in the journal Science, Orwig and colleagues reveal how they removed the testes from five rhesus macaques in two stages. Birth of monkey could help ensure boys with cancer can have families 2019-03-22T04:00:00Z It is considerably shorter than a testicular artery, which ultimately travels outside the body cavity to the testes, forming one component of the spermatic cord. Anatomy and Physiology 2013-06-19T00:00:00Z Then fragments of their preserved testes were thawed and were grafted underneath the monkey's skin. 'Baby Grady' gives hope to infertile boys 2019-03-21T04:00:00Z The drug aims to suppress levels of hormones that drive the production of sperm and testosterone in the testes. Hopes rise for male contraceptive pill breakthrough 2019-03-25T04:00:00Z FSH stimulates the Leydig cells in the testes and LH stimulates the Sertoli cells to synthesize and secrete testosterone. Biology for AP Courses 2022-06-09T00:00:00Z At that point, hormonal changes in the body ramp up testosterone levels, spurring stem cells in the testes to develop into sperm. First Baby Monkey Born Using Sperm from Frozen Testicles 2019-03-21T04:00:00Z The paired testes are a crucial component in this process, as they produce both sperm and androgens, the hormones that support male reproductive physiology. Anatomy and Physiology 2013-06-19T00:00:00Z If any cancerous material was hidden inside the testes, then it too would be frozen and reintroduced to the child's body along with the graft. 'Baby Grady' gives hope to infertile boys 2019-03-21T04:00:00Z Boys are born with stem cells inside little tubes in the testes, cells that start producing sperm after puberty’s testosterone jolt. Monkey birth a step to saving fertility of boys with cancer 2019-03-21T04:00:00Z FSH stimulates the Sertoli cells in the testes and LH stimulates the Leydig cells to synthesize and secrete testosterone. Biology for AP Courses 2022-06-09T00:00:00Z In rare cases, a patient’s cancer might damage the testes to the point where he is unable to produce sperm. First Baby Monkey Born Using Sperm from Frozen Testicles 2019-03-21T04:00:00Z This location is important in sperm production, which occurs within the testes, and proceeds more efficiently when the testes are kept 2 to 4°C below core body temperature. Anatomy and Physiology 2013-06-19T00:00:00Z “There’s a good reason the testes are outside the body,” noted Dr. Gage, adding that this keeps the sperm 6 to 10 degrees cooler than body temperature. Male Insect Fertility Plummets After Heat Waves 2018-11-13T05:00:00Z Mr. Harris, who now lives in Port Washington, N.Y., said that during a visit in the 1970s, the doctor massaged the area between his testes and anus, asking if it felt good. A Wave of Child Sexual Abuse Accusations Against a Doctor, and Hospital Says It Knew 2018-10-18T04:00:00Z FSH stimulates the Sertoli cells in the testes and LH stimulates the Leydig cells to synthesize and secrete testosterone. Biology for AP Courses 2022-06-09T00:00:00Z The scrotum—the dangling container for the testes, the organs that produce sperm—is an odd anatomical feature, and one found only in mammals. Science Has Resolved the Question of Boxers vs. Briefs 2018-08-09T04:00:00Z It continues internally to make up the scrotal septum, a wall that divides the scrotum into two compartments, each housing one testis. Anatomy and Physiology 2013-06-19T00:00:00Z “There’s a huge amount of growth and disappearance of bird gonads during the off-breeding season,” Dr. McGowan said, referring to the way bird testes may expand or shrink, depending on the time of year. Why Are Some Crows Committing Acts of Necrophilia? 2018-07-19T04:00:00Z This also meant that testicondy evolved after afrotherians split from other placental mammals, about 100 million years ago, which suggests the common ancestor of all mammals did indeed lower their testes, Dr. Hiller said. The Evolutionary Origin of Descending Testicles 2018-06-29T04:00:00Z TSH stimulates the Sertoli cells in the testes and LH stimulates the Leydig cells to synthesize and secrete testosterone. Biology for AP Courses 2022-06-09T00:00:00Z The protein turns the organs into testes which then steer the embryo down the path to maleness. Sex-change mice research could help humans, say scientists 2018-06-14T04:00:00Z Descending from the internal oblique muscle of the abdominal wall are the two cremaster muscles, which cover each testis like a muscular net. Anatomy and Physiology 2013-06-19T00:00:00Z But more likely, my nagging was just irking them, and it had nothing to do with their ovaries, testes or pituitary gland. Opinion | Stop Calling Women Hormonal 2018-06-02T04:00:00Z There is no characteristic that matters more than testes and testosterone. Sex, Sport, and Why Track and Field’s New Rules on Intersex Athletes Are Essential 2018-04-30T04:00:00Z What stimulates Leydig cells in the testes to produce testosterone? Biology for AP Courses 2022-06-09T00:00:00Z In the earliest stages of development, levels of SOX9 are driven by a gene on the Y chromosome, explaining why males typically develop testes. Sex-change mice research could help humans, say scientists 2018-06-14T04:00:00Z Figure 27.3 The Scrotum and Testes This anterior view shows the structures of the scrotum and testes. Anatomy and Physiology 2013-06-19T00:00:00Z Having to not have the testes transplanted is almost as bad as not having the penis transplanted, both because of the disfigurement and the need for lifelong testosterone injections. ‘Whole Again’: A Vet Maimed by an I.E.D. Receives a Transplanted Penis 2018-04-23T04:00:00Z Whenever Malaysian conservation officials temporarily captured males to put on GPS radio collars, the team weighed the monkeys and sized their testes. For This Monkey, a Bigger Nose Means a Better Sex Life 2018-02-21T05:00:00Z These hormones regulate the testes in males and ovaries in females. Biology for AP Courses 2022-06-09T00:00:00Z Writing in the journal, Science, the researchers show that Enh13 boosts SOX9 levels at precisely the right time to produce testes. Sex-change mice research could help humans, say scientists 2018-06-14T04:00:00Z Not only does the tunica albuginea cover the outside of the testis, it also invaginates to form septa that divide the testis into 300 to 400 structures called lobules. Anatomy and Physiology 2013-06-19T00:00:00Z I am really outraged they did not also implant the testes! ‘Whole Again’: A Vet Maimed by an I.E.D. Receives a Transplanted Penis 2018-04-23T04:00:00Z The brain and eyes have their own set of unique characteristics, but the testes set themselves apart in other ways. A Private Place Where HIV, Zika and Ebola Hide 2018-01-26T05:00:00Z FSH production is inhibited by the hormone inhibin, which is released by the testes. Biology for AP Courses 2022-06-09T00:00:00Z Sigmund Freud's first paper involved the dissection of eels in an attempt to locate their testes. Books in brief : Nature : Nature Research 2017-11-07T05:00:00Z During the seventh month of the developmental period of a male fetus, each testis moves through the abdominal musculature to descend into the scrotal cavity. Anatomy and Physiology 2013-06-19T00:00:00Z He takes testosterone to compensate for the loss of his testes, and is being treated with another drug, Cialis, to encourage erectile function. ‘Whole Again’: A Vet Maimed by an I.E.D. Receives a Transplanted Penis 2018-04-23T04:00:00Z The effects of immune privilege could have implications for diseases that manifest outside the testes. A Private Place Where HIV, Zika and Ebola Hide 2018-01-26T05:00:00Z The testes produce androgens, testosterone being the most prominent, which allow for the development of secondary sex characteristics and the production of sperm cells. Biology for AP Courses 2022-06-09T00:00:00Z Within days of her birth, Adams had surgery to remove her internal testes. The intersex rights movement is ready for its moment 2017-10-05T04:00:00Z This is called the “descent of the testis.” Anatomy and Physiology 2013-06-19T00:00:00Z I am quite distressed, however, that they did not also transplant the testes of the dead donor. ‘Whole Again’: A Vet Maimed by an I.E.D. Receives a Transplanted Penis 2018-04-23T04:00:00Z Human testes are less readily available than other tissue types donated to research, making it tough to validate findings in animal studies. A Private Place Where HIV, Zika and Ebola Hide 2018-01-26T05:00:00Z Early in the development of the embryo, specialized diploid cells, called germ cells, are produced within the gonads, such as the testes and ovaries. Biology for AP Courses 2022-06-09T00:00:00Z A 2015 study found that louder howler males have smaller testes and less sperm. This Bug's Penis Is a Built-In Violin 2017-10-07T04:00:00Z Spermatogonia are the stem cells of the testis, which means that they are still able to differentiate into a variety of different cell types throughout adulthood. Anatomy and Physiology 2013-06-19T00:00:00Z I pray he has a full recovery, and that gets a testes transplant too some day! ‘Whole Again’: A Vet Maimed by an I.E.D. Receives a Transplanted Penis 2018-04-23T04:00:00Z The virus has also been known to shrink testes. A Private Place Where HIV, Zika and Ebola Hide 2018-01-26T05:00:00Z Among men a hormonal contraceptive could inhibit testosterone production in the testes, reducing sperm levels. A New Push For the Male "Pill" 2017-09-25T04:00:00Z They live in small groups with harems of females, while males with larger testes share females and compete for reproductive success via sperm amount and quality. This Bug's Penis Is a Built-In Violin 2017-10-07T04:00:00Z Spermatogenesis, the production of sperm, occurs within the seminiferous tubules that make up most of the testis. Anatomy and Physiology 2013-06-19T00:00:00Z I also pray that the 1300 or so others who need this surgery get it quickly, that it is fully successful, and that they get testes too, so they can have children! ‘Whole Again’: A Vet Maimed by an I.E.D. Receives a Transplanted Penis 2018-04-23T04:00:00Z According to Routy, the pathways involved in protecting the testes are similar to those that allow tumors to escape the grips of the immune system. A Private Place Where HIV, Zika and Ebola Hide 2018-01-26T05:00:00Z “The amount of testosterone needed for sperm production in the testes is believed to be about 50 to 100 times greater than what is needed in the blood for other functions,” she notes. A New Push For the Male "Pill" 2017-09-25T04:00:00Z The group published its work in 2015, arguing that the tubes help testis cells to communicate precisely, sending a message to some of their neighbours and not others1. How the Internet of cells has biologists buzzing 2017-09-19T04:00:00Z The scrotum is the muscular sac that holds the testes outside of the body cavity. Anatomy and Physiology 2013-06-19T00:00:00Z He received scrotum, artificial testes are used for men with testicular cancer same as women who can receive breast implants. ‘Whole Again’: A Vet Maimed by an I.E.D. Receives a Transplanted Penis 2018-04-23T04:00:00Z The result indicated the virus could evade drug treatment by finding a home in the testes. A Private Place Where HIV, Zika and Ebola Hide 2018-01-26T05:00:00Z After reviewing more than 3800 scientific publications, the authors also found evidence that at least 11 viruses can live in the testes, including those that cause influenza, dengue, and severe acute respiratory syndrome. Human semen can host up to 27 different viruses 2017-09-20T04:00:00Z As she grew older, doctors discovered that - because of a rare chromosome condition - she lacked a uterus, and had internal testes rather than ovaries. Pressure mounts to curtail surgery on intersex children 2017-07-25T04:00:00Z A gene on the male’s Y chromosome called SRY is critical in stimulating a cascade of events that simultaneously stimulate testis development and repress the development of female structures. Anatomy and Physiology 2013-06-19T00:00:00Z Does that include human cells in ovaries and testes? Goat testicles in men, human organs in pigs: the past and future of xenotransplantation 2017-06-16T04:00:00Z In the several decades following Medawar’s report, people thought that physical barriers, such as the blood–brain barrier, the blood– retina barrier or the blood–testis barrier, made immune privilege possible. A Private Place Where HIV, Zika and Ebola Hide 2018-01-26T05:00:00Z "Ovaries and testes are the most sensitive organs to both acute and chronic radiation exposure." Frozen 'space sperm' passes fertility test - BBC News 2017-05-22T04:00:00Z When she was a teenager, doctors removed the testes, telling her they were removing potentially cancerous ovaries. Pressure mounts to curtail surgery on intersex children 2017-07-25T04:00:00Z Testosterone produced by Leydig cells in the embryonic testis stimulates the development of male sexual organs. Anatomy and Physiology 2013-06-19T00:00:00Z Jeanette, now 71, was operated on at the age of 16 to remove her hidden testes. Intersex patients 'routinely lied to by doctors' - BBC News 2017-05-22T04:00:00Z Compared to the brain and eyes, “our understanding of the immune mechanisms in testes is very limited,” says Saguna Verma, an infectious disease researcher at the University of Hawaii in Honolulu. A Private Place Where HIV, Zika and Ebola Hide 2018-01-26T05:00:00Z Genomic DNA was extracted from testes and sperm of two individuals. The crown-of-thorns starfish genome as a guide for biocontrol of this coral reef pest : Nature : Nature Research 2017-04-04T04:00:00Z Vago says she was left with a host of health problems after her testes were removed. Intersex people on Hanne Gaby Odiele: ‘We’re very proud of her. It’s been a big taboo’ 2017-01-25T05:00:00Z A baby’s gender is determined at conception, and the the testes and ends as the sperm leave the penis through different genitalia of male and female fetuses develop from the urethra. Anatomy and Physiology 2013-06-19T00:00:00Z In primates, testis size is inversely correlated with harem formation. Why do some mammals have a bone in their penises? 2016-12-13T05:00:00Z Verma speculates that a breakdown of the barrier could mean that Zika from elsewhere in the testes could get to sperm cells. A Private Place Where HIV, Zika and Ebola Hide 2018-01-26T05:00:00Z Schlegel also says that regular exercise can improve circulation and make the blood vessels healthier, which may benefit the testes, an organ that’s sensitive to and requires good blood flow. Exercise May Be the Key to Better Sperm 2016-12-05T05:00:00Z Testosterone is a steroid hormone that in men is produced by the testes. Science explains why the “dad bod” may actually not be so unhealthy 2016-11-04T04:00:00Z Alternatively, as the environmental temperature increases, the scrotum relaxes, moving the testes farther from the body core and increasing scrotal surface area, which promotes heat loss. Anatomy and Physiology 2013-06-19T00:00:00Z This, the story goes, is why gorillas, which form harems, have much smaller testes, relative to their body sizes, than do chimpanzees, which are promiscuous. Why do some mammals have a bone in their penises? 2016-12-13T05:00:00Z The importance of macrophages is underscored by Routy’s work with donated testes. A Private Place Where HIV, Zika and Ebola Hide 2018-01-26T05:00:00Z The testes in infected mice were also smaller compared to those in uninfected animals. Zika Virus Reduces Male Fertility In Mice 2016-10-31T04:00:00Z Tissues such as the testes, brain, breasts and joint spaces offer the virus a sanctuary from the immune system. Ebola survivors fight reminders like blindness, epilepsy 2016-10-30T04:00:00Z Beneath the tunica vaginalis is the tunica albuginea, a tough, white, dense connective tissue layer covering the testis itself. Anatomy and Physiology 2013-06-19T00:00:00Z You therefore need to generate fewer sperm, and so can get away with smaller testes. Why do some mammals have a bone in their penises? 2016-12-13T05:00:00Z Zika also has a detrimental effect on testes and their function. A Private Place Where HIV, Zika and Ebola Hide 2018-01-26T05:00:00Z Whether similar damage is occurring in the testes of men infected with Zika isn’t clear yet. Zika Virus Reduces Male Fertility In Mice 2016-10-31T04:00:00Z That means that while an inflammatory response might surge elsewhere in the body, organs such as the brain and testes can protect themselves from severe swelling. Ebola survivors fight reminders like blindness, epilepsy 2016-10-30T04:00:00Z Cryptorchidism is the clinical term used when one or both of the testes fail to descend into the scrotum prior to birth. Anatomy and Physiology 2013-06-19T00:00:00Z It might therefore be expected that baculum size correlates with testis size. Why do some mammals have a bone in their penises? 2016-12-13T05:00:00Z “All the tools used by Mother Nature in the testes and eyes are similar to tools used in cancer,” Routy says. A Private Place Where HIV, Zika and Ebola Hide 2018-01-26T05:00:00Z For one, related viruses like West Nile or dengue do not seem to cause the same damage to the testes in the mice that Diamond tested as Zika. Zika Virus Reduces Male Fertility In Mice 2016-10-31T04:00:00Z “It’s probably connected to how it persists in the testes and the central nervous system - these protected zones.” Ebola survivors fight reminders like blindness, epilepsy 2016-10-30T04:00:00Z The tightly coiled seminiferous tubules form the bulk of each testis. Anatomy and Physiology 2013-06-19T00:00:00Z In those earlier experiments Dr Hayashi injected them into the testes of newly born mice, thus persuading them to become sperm when they underwent meiosis. Making sex cells from body cells 2016-10-17T04:00:00Z Routy adds that, historically, boys with leukemia were more likely than girls to experience a disease relapse because the cancer can hide in the testes. A Private Place Where HIV, Zika and Ebola Hide 2018-01-26T05:00:00Z She has always identified as a woman, but she has many of the physiological features of a man, including internal testes and an exceptionally high testosterone level. Caster Semenya and the Logic of Olympic Competition 2016-08-12T04:00:00Z Like the Egyptians before them, the Greeks made the connection between testes and strength. Doping Wasn’t Always Considered Cheating 2016-08-10T04:00:00Z They are composed of developing sperm cells surrounding a lumen, the hollow center of the tubule, where formed sperm are released into the duct system of the testis. Anatomy and Physiology 2013-06-19T00:00:00Z They cannot conclusively say that the dog food is a direct or even the only source of the chemicals found in the testes. Decline in quality of dogs’ sperm may be linked to environment, study says 2016-08-09T04:00:00Z In September last year, his team reported that the live-attenuated vaccine was able to protect male mice from Zika-related damage to the testes. A Private Place Where HIV, Zika and Ebola Hide 2018-01-26T05:00:00Z They cannot even conclusively say that the dog food is a direct or even the only source of the chemicals found in the testes. A Warning for Dogs, and Their Best Friends, in Study of Fertility 2016-08-09T04:00:00Z Spermatogenesis, the process which takes place in men's testes to produce sperm, is an altogether less predictable process and is not so much controlled by hormones as by enzymes. Winning the Campaign to Curb Teen Pregnancy 2016-07-19T04:00:00Z Sperm leave the rete testes, and the testis itself, through the 15 to 20 efferent ductules that cross the tunica albuginea. Anatomy and Physiology 2013-06-19T00:00:00Z This entails having her undescended testes surgically removed or taking hormone-suppressing drugs. The Humiliating Practice of Sex Testing Female Athletes 2016-06-28T04:00:00Z “We know that sexual transmission happens,” he says, so it’s a matter of figuring out how to get compounds to infiltrate the testes. A Private Place Where HIV, Zika and Ebola Hide 2018-01-26T05:00:00Z And while undescended testes can have a genetic component, it occurred in all five breeds, suggesting another cause. A Warning for Dogs, and Their Best Friends, in Study of Fertility 2016-08-09T04:00:00Z They mean, “Can I bear to watch a woman do this without my testes crawling back up inside my body?” Hillary Clinton in charge is OK, but Elizabeth Warren, too? That’s pushing it | Hadley Freeman 2016-06-18T04:00:00Z In this case, the doctors at Mass General did not transplant the donor’s testes. 8 Facts About How Penis Transplants Work 2016-05-16T04:00:00Z Still other intersex women have XY chromosomes and internal testes but appear female their whole lives, developing rounded hips and breasts, because their cells are insensitive to testosterone. The Humiliating Practice of Sex Testing Female Athletes 2016-06-28T04:00:00Z On the flip side, immune privilege allows foreign invaders, including viruses, to find protection from the immune system within the testes. A Private Place Where HIV, Zika and Ebola Hide 2018-01-26T05:00:00Z It acts on the pancreas, the testis, on the muscles and on the liver, and it gets into the brain. How Exercise Improves Brain Function 2016-05-06T04:00:00Z Complex hormonal interactions between the hypothalamus, the pituitary, and the Leydig cells in the testes bring this about. “Male contraceptive options haven’t changed since Elvis was thin”: These revolutionary alternatives to condoms are dragging male birth control into the 21st century 2016-04-21T04:00:00Z The hospital says it is possible that reproductive function can be restored in the future when recipients still have their own testes. 8 Facts About How Penis Transplants Work 2016-05-16T04:00:00Z A more detailed investigation showed that although the outside of her body was fully female, Patiño had XY chromosomes and internal testes. The Humiliating Practice of Sex Testing Female Athletes 2016-06-28T04:00:00Z The tightly held space between Sertoli cells—known as the blood– testis barrier—keeps immune cells from reaching sperm. A Private Place Where HIV, Zika and Ebola Hide 2018-01-26T05:00:00Z Sons of men who developed early also grew enlarged testes about 9 1/2 months sooner. If parents went through early puberty, their kids probably will, too 2016-04-18T04:00:00Z Most hormonal methods of male contraception seek to create a negative feedback loop that by increasing testosterone elsewhere decreases testosterone in the testes. “Male contraceptive options haven’t changed since Elvis was thin”: These revolutionary alternatives to condoms are dragging male birth control into the 21st century 2016-04-21T04:00:00Z Transplanting donor testes raises lots of ethical questions, including who would be considered the father should a man have a child with the donated testes, and therefore have sperm and genetic material from the donor. 8 Facts About How Penis Transplants Work 2016-05-16T04:00:00Z Instead they “put their energy into growing absolutely gigantic testes,” about 20 percent of their body weight. For These Trickster Animals, Every Day is April Fools What’s more, testosterone-producing Leydig cells, which lie adjacent to the seminiferous tubules in the testes and help maintain fertility, seemed to be a target and potentially a reservoir for the virus. A Private Place Where HIV, Zika and Ebola Hide 2018-01-26T05:00:00Z The virus became concentrated in the brains and testes, reflecting the damage it is thought to cause in humans, Dr. Rossi said. Zika Study Could Help Overcome an Obstacle to Vaccine Research 2016-03-28T04:00:00Z The aim is to lower testosterone inside the testes while maintaining normal levels in the body as a whole. “Male contraceptive options haven’t changed since Elvis was thin”: These revolutionary alternatives to condoms are dragging male birth control into the 21st century 2016-04-21T04:00:00Z More specifically, Blazer said, males were growing immature eggs within their testes. Sexual oddities plague bass in Chesapeake Bay tributaries 2016-03-12T05:00:00Z One question, Donovan poses, "How can we tell if spermatids made in a laboratory are really of the same high quality as those made and tested by natural selection in the testis?" Researchers made sperm-like cells and used them to create new mice 2016-02-25T05:00:00Z Verma says the community of researchers interested in understanding immune privilege in the testes is also relatively small. A Private Place Where HIV, Zika and Ebola Hide 2018-01-26T05:00:00Z Making sperm in the testes is one of the longest and most complicated processes in the body - taking more than a month from start to finish in most mammals. Lab-sperm leads to healthy baby mice - BBC News 2016-02-25T05:00:00Z Sperm production begins in puberty and continues through adulthood, maintained by high levels of testosterone within the testes. “Male contraceptive options haven’t changed since Elvis was thin”: These revolutionary alternatives to condoms are dragging male birth control into the 21st century 2016-04-21T04:00:00Z The transplant does not involved the testes, which produce sperm, so if a man who received a transplant does father a child, the babe would be his genetic offspring, not the donor’s. Wounded U.S. soldier to received first U.S. penis transplant 2016-02-19T05:00:00Z Supplements are approved only for treating testosterone deficiency caused by certain medical conditions, such as problems with the testes, but they have become a multibillion-dollar industry, feeding on aging men’s desire to remain youthful. Study finds testosterone gel is no fountain of youth 2016-02-17T05:00:00Z Exactly how HIV and other viruses manage to gain entry into the testes and stay, often for years on end, without being detected by the immune system is still being worked out by scientists. A Private Place Where HIV, Zika and Ebola Hide 2018-01-26T05:00:00Z Supplements are approved only for treating testosterone deficiency caused by certain medical conditions, such as problems with the testes, but they have become a multibillion-dollar industry, feeding on aging men's desire to remain youthful. A landmark study suggests that testosterone treatment is no fountain of youth 2016-02-17T05:00:00Z The entire process takes between 74 and 120 days, and the testes produce 200 to 300 million sperm each day. “Male contraceptive options haven’t changed since Elvis was thin”: These revolutionary alternatives to condoms are dragging male birth control into the 21st century 2016-04-21T04:00:00Z The study, published in Proceedings of the National Academy of Sciences, analysed 14 testes from men aged between 39 and 90. Mutant sperm-factories spread in testes - BBC News 2016-02-08T05:00:00Z Rather, it stimulates a man’s testes to produce natural testosterone, which then does the muscle-bulking. No more horsing around 2016-02-04T05:00:00Z The testes seem to be a particularly understudied area among immune-privileged sites, which also include the eye and the brain. A Private Place Where HIV, Zika and Ebola Hide 2018-01-26T05:00:00Z Very severe levels of feminization—having a lot of egg cells in the testes—can impair sperm quality, impeding a fish’s ability to reproduce. Why Are These Males Growing Eggs? She had, in fact, undergone an orchiectomy, or removal of the testes, a couple of months prior. ‘A Whole New Being’: How Kricket Nimmons Seized the Transgender Moment 2015-12-12T05:00:00Z The researchers explored the "massive tangle of spaghetti" inside the testes to find the areas producing diseased sperm. Mutant sperm-factories spread in testes - BBC News 2016-02-08T05:00:00Z When you’re in the field and you look up at the monkeys, you notice that in Alouatta palliata, the mantled howler monkey, that the testes are huge. Howler Monkeys Trade Testicles for Decibels 2015-11-13T05:00:00Z In Ebola, macrophages seem to be a reservoir for virus in the tightly coiled tube, known as the epididymis, that is present on the outside of testes and helps transport sperm to the ejaculatory ducts. A Private Place Where HIV, Zika and Ebola Hide 2018-01-26T05:00:00Z They were conducting a post-mortem examination to determine the causes of a smallmouth bass die-off when they found male fish with female egg cells in their testes. Why Are These Males Growing Eggs? That is because some parts of the body, including the eyes, the brain and the testes, are “immunologically privileged.” Ask Well: Ebola and Sex 2015-11-13T05:00:00Z Millions of spermatogonia produce a constant supply of sperm in the testes. Mutant sperm-factories spread in testes - BBC News 2016-02-08T05:00:00Z Unlike sperm, which the testes churn out into old age, the eggs you’re born with are all the eggs you’ll ever get—or so say the textbooks. Feature: A controversial company offers a new way to make a baby 2015-11-05T05:00:00Z Except when viruses like Zika and HIV take refuge in the testes, immune privilege is a necessary benefit that protects sperm cells, and so targeting only the virus will be key. A Private Place Where HIV, Zika and Ebola Hide 2018-01-26T05:00:00Z But feminization is a continuum: Males with only a few eggs in their testes may have no trouble at all reproducing. Why Are These Males Growing Eggs? Right: Bull testes thrown on the ground after castrating at Rockhampton Downs station. Balls and Bulldust: the raw 1980s photos of cattle stations that time almost forgot 2015-11-03T05:00:00Z But as they report online today in Current Biology, there is a clear inverse linear relationship between the size of a monkey’s hyoid and the size of his testes. Big testicles mean a softer voice, at least in howler monkeys 2015-10-22T04:00:00Z As for extending the research, perhaps into the monkeys’ natural habitat, she said, “We have to come up with another way to measure testes size if we’re working in the field.” Seductive Bass Tones Enough to Seal the Deal in Some Monkey Species 2015-10-22T04:00:00Z He adds that allowing the entrance of viruses into a testis is also not ideal because clearing virus in the absence of regular immune mechanisms is difficult. A Private Place Where HIV, Zika and Ebola Hide 2018-01-26T05:00:00Z The presence of female eggs in male testes indicates some kind of hormonal confusion. Why Are These Males Growing Eggs? "It may be that investment in developing a large vocal organ and roaring is so costly that there is simply not enough energy left to invest in testes," Dunn said. Monkeys' Balls Show How Men Overcompensate 2015-10-21T04:00:00Z It’s here that it slips under the prostate gland and seminal vesicles in men, which store and bathe the sperm that have migrated up from the testis, and the cervix and womb in women. Babies ruined my orgasm: How trying to have kids sucked all the pleasure out of sex 2015-10-18T04:00:00Z The testes are one place; so are the eyes, parts of the joints and the brain. Ebola lingers in semen for months, studies confirm 2015-10-15T04:00:00Z A vaccine-based approach, in which the body is inoculated and gets rid of virus before it has a chance to enter the testes, may be a good solution. A Private Place Where HIV, Zika and Ebola Hide 2018-01-26T05:00:00Z About 85 percent of male smallmouth bass collected in national wildlife refuges in the Northeastern U.S. had eggs were growing in their testes. Why Are These Males Growing Eggs? "Alternatively, using a large vocal organ for roaring may be so effective at deterring rival males that there is no need to invest in large testes." Monkeys' Balls Show How Men Overcompensate 2015-10-21T04:00:00Z Scientists have long known that the Ebola virus can persist for months in certain tissues of the body that are relatively protected from the immune system, including the eyes and the testes. Scottish Nurse Who Had Ebola Is Back in Hospital and Critically Ill 2015-10-14T04:00:00Z Ideally, such TCRs would target tumour-associated antigens from endogenous proteins that are not being expressed — at the same time or at detectable levels — by normal tissues, such as carcinoembryonic or cancer testis antigens. Gene therapy returns to centre stage : Nature : Nature Publishing Group 2015-10-13T04:00:00Z Another group, based in Canada, has been testing a DNA-based vaccine for Zika and similarly found that mice were able to make antibodies in response to the vaccine, which prevented damage to mouse testes. A Private Place Where HIV, Zika and Ebola Hide 2018-01-26T05:00:00Z Their conclusion: An astonishing 60 to 100 percent of all the male smallmouth bass they examined had female egg cells growing in their testes. Why Are These Males Growing Eggs? However, there are parts of the body where the immune system is weaker, such as the eye, nervous system, cartilage and testes. What are the risks of Ebola recurring? - BBC News 2015-10-09T04:00:00Z Currently the strongest option for men is a vasectomy, which prevents sperm from leaving the testes. Altering how sperm develop could lead to a reversible male birth control 2015-10-04T04:00:00Z Like the other Guevedoces, Johnny was brought up as a girl because he had no visible testes or penis and what appeared to be a vagina. The extraordinary case of the Guevedoces - BBC News 2015-09-19T04:00:00Z Beyond HIV, which can hide in the testes, Zika is “exactly the type of situation where our work could help,” Cherrington says. A Private Place Where HIV, Zika and Ebola Hide 2018-01-26T05:00:00Z She had also undergone a removal of the testes, which reduces testosterone, and won the right to amend her birth certificate. Transgender Judge Phyllis Frye’s Early, Transformative Journey 2015-08-29T04:00:00Z The North Brunswick, New Jersey, boy had testes tissue removed earlier this year at the Philadelphia hospital after a stem cell transplant, before starting chemotherapy. Kids with cancer get futuristic chance at saving fertility 2015-08-11T04:00:00Z The cells in the testes needed to produce testosterone--the Leydig cells--will function better. Fitness Friday: Need More T?: The Loop 2013-10-16T04:00:00Z This time the body does respond and they sprout muscles, testes and a penis. The extraordinary case of the Guevedoces - BBC News 2015-09-19T04:00:00Z “Also, it’s not really an easy subject you can bring up, like, ‘Hey, can we have your testes?’” A Private Place Where HIV, Zika and Ebola Hide 2018-01-26T05:00:00Z Doctors first noticed her slightly enlarged genitals, and then discovered she had testes inside her abdomen and male chromosomes. Intersex surgeries spark move away from drastic treatment 2015-04-17T04:00:00Z In lab animals, it’s worked with frozen and thawed testes tissue. Kids with cancer get futuristic chance at saving fertility 2015-08-11T04:00:00Z Certain parts of the body, including the testes in men and the placenta in pregnant women, are protected from the immune system and may harbor viruses even after blood tests turn negative. Ebola Researchers Take New Look at Risk of Sexual Transmission 2015-04-16T04:00:00Z At six weeks, the gonad switches on the developmental pathway to become an ovary or a testis. Sex redefined 2015-02-17T05:00:00Z His group has characterized how a family of drugs used against HIV and other viruses, the nucleoside analogs, cross the blood–testis barrier. A Private Place Where HIV, Zika and Ebola Hide 2018-01-26T05:00:00Z Undescended testes were removed to prevent them from developing cancer; some doctors now think affected children can be monitored instead. Intersex surgeries spark move away from drastic treatment 2015-04-17T04:00:00Z So you semi-domesticate them by half-castrating them, and the way the native Sami people of Norway do that is with their teeth, destroying the testes but not removing them. Behind the Scenes of ‘Earth a New Wild,’ PBS’s New Nature Show “Exposure is not just affecting cells in testis but the whole animal,” Hunt said. BPA Exposure May Change Stem Cells, Lower Sperm Production 2015-01-22T05:00:00Z If a testis develops, it secretes testosterone, which supports the development of the male ducts. Sex redefined 2015-02-17T05:00:00Z It shows the testes needed the most distinct suite of proteins to function. Testes 'most distinct human tissue' 2014-11-07T05:00:00Z Whereas human testes top out at about 50 grams, chimpanzees’ routinely reach weights of 150 to 170 grams. Why humans are less well-endowed than chimps 2014-10-30T04:00:00Z Astley was principally concerned with treating disease of the testis, and never followed up on this discovery. The kindest cut: my journey into the nether regions of male birth control 2014-10-30T04:00:00Z “The negative effects of estrogenic chemicals on the developing male include an expanding list of subtle changes to the developing brain, reproductive tract, and testis,” the authors wrote. BPA Exposure May Change Stem Cells, Lower Sperm Production 2015-01-22T05:00:00Z Cigarette toxins affect the stem cells in the testes, McLaughlin says, which results in permanently lowered sperm production—and these results likely apply to humans, she adds. Why Pregnant Moms Who Smoke Might Have Kids With Worse Sperm 2014-10-02T04:00:00Z But while pelvis and testes were correlated in size, ribs were not. Long-forgotten secrets of whale sex revealed The RNA-seq columns from heads, testes and ovaries are as described in a. Diversity and dynamics of the Drosophila transcriptome : Nature : Nature Publishing Group 2014-03-15T04:00:00Z Each time a different batch of male fish with eggs in their testes shows up in the Chesapeake Bay watershed, Vicki Blazer’s eyebrows arch a bit higher. As more male bass switch sex, a strange fish story expands Trust me, you will want your testes as small and hidden as possible. 5 Reasons Dads Shouldn't Work Outside the Home 2014-06-30T04:00:00Z When he did that, I discovered that one of the supplements listed “ground bull testes” as an ingredient. Is The Nutritional Supplement Industry Feeding You Bull Balls For Breakfast? 2014-06-26T04:00:00Z These include men born with genetic diseases or whose testes no longer function after chemotherapy. How many middle-aged men need HRT? 2014-04-27T23:40:39Z The RNA-seq columns from heads, testes and ovaries are as described in a. Diversity and dynamics of the Drosophila transcriptome : Nature : Nature Publishing Group 2014-03-15T04:00:00Z Somehow, the information about the frightening smell gets into a mouse's testes and results in lower methylation of the Olfr151 gene in sperm DNA. Epigenetics: The sins of the father 2014-03-05T18:50:37.761Z Flame retardants are a scary business: they have been tied to lower IQs, slowed cognitive development and undescended testes in young boys. What You Need to Know about Flame Retardants 2014-03-02T13:30:00Z Some studies showed the drug hampers the ability of the testes to descend during development as well. Tylenol and ADHD 2014-02-25T05:35:22Z Notwithstanding the recent studies' shortcomings, in January the FDA reiterating that testosterone drugs should only be prescribed to men with low testosterone associated with a medical problem, i.e. one that prevents the testes producing testosterone. How many middle-aged men need HRT? 2014-04-27T23:40:39Z Consistent with the extensive transcriptional differences observed in testes compared to other tissues, the genes containing male-specific exons are enriched in functions related to transcription. Diversity and dynamics of the Drosophila transcriptome : Nature : Nature Publishing Group 2014-03-15T04:00:00Z With current technology, the only way to find out if a man has viable sperm is to carry out surgery to look for sperm in the testes. Sperm test hope for infertile men 2013-11-21T02:25:27Z Even when the user stops, it takes a while for the testes to regain function after the slumber induced by juicing. If a patient knowingly endangers himself, can a doctor deny him medical tests? 2013-11-18T22:07:57Z Men's testes' volume varied considerably — from a little more than a tablespoon in volume to about a quarter cup. Smaller Testicles Linked with Caring Fathers 2013-09-09T22:45:00.583Z “It could be that as men become more involved in caregiving the testes shrink.” Study: Choose Dads With Smaller 'Nads 2013-09-09T20:35:24Z Prosecutors withdrew that claim and Pistorius' representatives identified the substance he was using as a legal herbal remedy called testis compositum. Witnesses to tell of Pistorius' character at trial 2013-08-25T17:09:48Z In the second half of development, testosterone produced by the fetal testes is released into the bloodstream and enters the growing brain. Touching a Nerve : Exploring the Implications of the Self as Brain, Part 1 [Excerpt] 2013-07-26T14:45:03.867Z Instead, they are active in the testis, primarily in tissue destined to become sperm, Page's team reports. 'Female' Chromosome May Leave a Mark on Male Fertility 2013-07-21T18:30:00Z The team also scanned the participants' testes to assess volume and measured testosterone levels from blood samples. Smaller Testicles Linked with Caring Fathers 2013-09-09T22:45:00.583Z But the role of the testes came about by accident. Losing the "taste" for sperm 2013-07-01T21:15:06.947Z The cancer responded to the standard treatment — castration or, in the case of patients, chemical castration with a drug that shuts off testosterone production in the testes. In a Hospital for Mice, Hope for Men 2013-06-10T19:20:41Z Biologists fear that pesticides, mixed with hormones from human pharmaceuticals in urban wastewater that pours into rivers, are causing male bass to develop eggs in their testes, switching sex. Bay’s smallmouth bass under siege, report says 2013-04-26T00:41:11Z It found feminization in both largemouth and smallmouth bass — eggs in the testes of males. Bay’s intersex fish mystery remains unsolved 2013-03-17T22:45:18Z So last November they retested the original fish samples, and reread the pathology report, and realized that the eggs found on the males were not actually inside their testes. Tainted Samples Caused Gender-Bending Ocean Fish 2013-02-07T16:15:03.753Z The sperm couldn’t swim, and the testes themselves looked malformed. Losing the "taste" for sperm 2013-07-01T21:15:06.947Z “It suggests that in some cases, testes are working more optimally to produce high numbers of consistently manufactured sperm, and vice versa.” News for Men: Size Matters When it Comes to Your Swimmers 2012-11-14T15:29:45Z The new study involved testes measurements in more than 4,000 boys. Earlier puberty seen in boys, just like in girls 2012-10-20T03:10:05Z But while those findings may be salutary for men who are active and fit, or planning to become so, they seem potentially troubling for those of us without testes. Well: Sex Hormones and the Brain 2012-09-12T04:09:10Z Male testosterone is mainly produced in the testes and affects muscle mass, sperm production and various sexual characteristics. Testosterone marketing frenzy draws skepticism 2012-09-09T18:46:04Z The two receptor subunits might be involved in taste…but they are also involved in testes! Losing the "taste" for sperm 2013-07-01T21:15:06.947Z It targets a protein which exists only in the testes and is critical for sperm production. Research 'raises male pill hope' 2012-08-17T00:41:38Z Enlargement of testes is generally the earliest sign of puberty in boys. Earlier puberty seen in boys, just like in girls 2012-10-20T03:10:05Z Bradner said his team is working to refine the drug so that it only acts on cells in the testes, and not on cancer cells. Study in mice raises hopes for birth control pill for men 2012-08-16T17:17:17Z The compound had no apparent effect on the production of testosterone or other hormones made by the testes. 'The Pill' for Men Is Closer to Reality 2012-08-16T17:06:17Z This is a normal mouse, and you’re looking inside the testis. Losing the "taste" for sperm 2013-07-01T21:15:06.947Z The testes of mice taking the drug began to shrink as they produced fewer sperm, which were also less mobile. Research 'raises male pill hope' 2012-08-17T00:41:38Z Pubic-hair growth, another early sign of puberty, started about a year after testes enlargement in all groups but still earlier than previously thought. Earlier puberty seen in boys, just like in girls 2012-10-20T03:10:05Z In one study, mice genetically engineered to lack functional telomerase showed brain degeneration and shrunken testes, but those effects were reversed when the enzyme was reactivated. Lawsuit challenges anti-ageing claims 2012-08-01T17:50:36.320Z That means that there are fewer sperm precursor cells in the testis, and few of those go on to produce functional sperm. 'The Pill' for Men Is Closer to Reality 2012-08-16T17:06:17Z This may mean that herbicides taste sweet, but it could also mean that the TAS1R3, when expressed in places like…the testes…may be affected by the presence of these sweeteners or herbicides. Losing the "taste" for sperm 2013-07-01T21:15:06.947Z The wandering cells are caught up in the embryo’s initial folds into three layers, then, following signals sent out by nearby cells, migrate to a structure called the genital ridge, which becomes the testes. Amniotic Fluid + Valproic Acid = New Source of Human Stem Cells 2012-07-03T16:15:04.193Z In the testes, Katnal1 regulates a protein needed by cells that support sperm maturation; without it, sperm do not develop properly and the body disposes of them. The New Era of Contraception, Thanks to Gene Discovery? 2012-05-26T05:05:38Z If we can find a way to target this gene in the testes, we could potentially develop a non-hormonal contraceptive. Male 'contraceptive gene' found 2012-05-24T23:04:41Z In the latter example, translates to “penis at twelve” and these intersex individuals are born with undescended testes along with an absent or clitorislike penis. The Allure of Gay Cavemen 2012-05-23T16:45:00.660Z Thus in experiments on mammals it was found that the proportion of alcohol in the ovary to that in the blood was as three to five, and in the testis as two to three. Being Well-Born An Introduction to Eugenics 2012-05-22T15:16:53.140Z Decrepit, infertile mice with shriveled testes and diminished cognitive functioning began to bounce back. The Hunt for an Anti-Aging Pill Is on 2012-05-14T13:20:00Z In their rat study, exposure to high-frequency ultrasound for two 15-minute sessions, two days apart, was enough to kill existing sperm in the testes and stop the development of additional sperm. The New Era of Contraception, Thanks to Gene Discovery? 2012-05-26T05:05:38Z Then the researchers spotted something particular about the males: they projected their testes outward, which endowed them with a certain “mouse swagger,” Erdman says. Mice That Eat Yogurt Have Larger Testicles 2012-05-04T12:15:00.433Z Denunciatio was the official act of the public officer, such as the testis synodalis or archdeacon, who summoned the court to take action against offenders coming within his official knowledge. A History of The Inquisition of The Middle Ages; volume I 2012-04-17T02:00:16.473Z A male from the Sierra Madre that was obtained on January 5 had testes 8 mm. long. The Recent Mammals of Tamaulipas, Mexico 2012-04-06T02:00:23.953Z But each winter and early spring, sex hormones flood the males' bodies, plump up their testes and fire up their sperm factories in preparation for a very brief mating season. In the Heat for a Moment: The Male Giant Panda's Sex Drive Fluctuates to Match the Female's Short-Lived Libido 2012-04-04T20:15:00.213Z The paired testes of the male consist of a variable number of seminal tubes, those of each testis opening into a vas deferens. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 4 "Hero" to "Hindu Chronology" 2012-04-04T02:00:56.447Z Of both sexes; hermaphrodite; as a flower with stamens and pistil, or an animal having ovaries and testes. Webster's Unabridged Dictionary (2nd 100 Pages) 2012-03-24T02:00:19.387Z The orifices and prominences of the body, the retained testis in the inguinal canal, are notoriously liable seats of tumors. A System of Practical Medicine by American Authors, Vol. I Volume 1: Pathology and General Diseases 2012-03-17T02:00:54.097Z A male having testes 11 mm. long was in the nest. The Recent Mammals of Tamaulipas, Mexico 2012-04-06T02:00:23.953Z Between March 22 and April 15, the peak breeding season, the male giant pandas' testes were nearly three times larger than in the nonbreeding season, between June 1 and September 30. In the Heat for a Moment: The Male Giant Panda's Sex Drive Fluctuates to Match the Female's Short-Lived Libido 2012-04-04T20:15:00.213Z In the male of Phyllodromia the rudiment of a vestigial ovary becomes separated from the developing testis, indicating perhaps an originally hermaphrodite condition. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 4 "Hero" to "Hindu Chronology" 2012-04-04T02:00:56.447Z Reproductive System.—The testes are situated in a distinct sessile or slightly pedunculated scrotum, into which they descend from the sixth to the tenth month after birth. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 6 "Home, Daniel" to "Hortensius, Quintus" 2012-03-15T02:00:32.250Z Crucially, it does so in all testosterone-producing tissues, particularly including the adrenal glands, not just the testes. Treating prostate cancer: The men?s room 2012-03-08T16:00:34Z Furthermore, the two species may differ in time of breeding; in August, males of pectoralis had the testes well developed when those organs were small in boylii collected at the same locality. The Recent Mammals of Tamaulipas, Mexico 2012-04-06T02:00:23.953Z I had originally assumed that all adult males would be fertile throughout the breeding season, and that any males with abdominal testes would be subadults or young of the year. Comparative Ecology of Pinyon Mice and Deer Mice in Mesa Verde National Park, Colorado 2012-02-24T03:00:32.243Z A gene within the chromosome is the switch which leads to testes development and the secretion of male hormones. Male extinction theory challenged 2012-02-22T18:39:44Z In a new study, researchers implanted estrogen capsules near the testes of male snakes to mimic the location of the hormone's production in females. ScienceShot: Sexy Snake Skin 2012-02-09T19:29:01Z Others imagine that the citron is intended, whose shape makes it an emblem of the testis. Ancient Pagan and Modern Christian Symbolism With an Essay on Baal Worship, On The Assyrian Sacred "Grove," And Other 2012-01-05T03:00:28.663Z The testes increase in size gradually rather than rapidly at maturity or in each breeding season, but seasonal cycles in sperm production occur. Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia) 2011-12-17T03:00:17.963Z Most juvenal males did not have scrotal testes, and many juveniles that appeared repeatedly in traps from mid-July through late October did not attain breeding condition. Comparative Ecology of Pinyon Mice and Deer Mice in Mesa Verde National Park, Colorado 2012-02-24T03:00:32.243Z It is a gene within the Y chromosome which triggers the development in the embryo of male testes and the secretion of male hormones. Male extinction theory challenged 2012-02-22T18:39:44Z These specimens were from breeding populations, as evidenced by pregnancy of females and by large size of testes of males. The Baculum in Microtine Rodents 2011-11-17T03:00:33.777Z He was associated with Anu, lord of solids and of the lower world, equivalent to the "testis," or egg on the right side. Ancient Pagan and Modern Christian Symbolism With an Essay on Baal Worship, On The Assyrian Sacred "Grove," And Other 2012-01-05T03:00:28.663Z The right testis is always longer than the left. Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia) 2011-12-17T03:00:17.963Z Only one adult of each species had scrotal testes after late September; the P. truei had scrotal testes on October 24, 1963, and the P. maniculatus had scrotal testes on October 15 of that year. Comparative Ecology of Pinyon Mice and Deer Mice in Mesa Verde National Park, Colorado 2012-02-24T03:00:32.243Z The large size of the testes of this individual indicates breeding condition. Vertebrates from the Barrier Island of Tamaulipas, M?xico 2011-11-15T03:00:17.973Z Variability in length of testes is greatest when voles are from 140 to 150 mm. in total length. The Baculum in Microtine Rodents 2011-11-17T03:00:33.777Z Except from actual growths within the testis, of which it was a mere symptom, I have never seen neuralgia of the testis save from one of three causes. Neuralgia and the Diseases that Resemble it 2011-10-03T02:00:31.460Z Since the animal's testes and canine lengths were considerably greater than those of pups caught in a later study, we presume 1051 was 18 or 30 months old. Ecological Studies of the Timber Wolf in Northeastern Minnesota 2011-10-03T02:00:28.037Z Fertility customarily is determined by sectioning testes and noting the presence or absence, and relative abundance, of sperm. Comparative Ecology of Pinyon Mice and Deer Mice in Mesa Verde National Park, Colorado 2012-02-24T03:00:32.243Z The epididymis is ordinarily dark brown or black and contrasts sharply with the color of the testes. Natural History of the Ornate Box Turtle, Terrapene ornata ornata Agassiz 2011-10-01T02:00:30.200Z The three bacula are from adult voles having testes that measured 15, 16 and 16 mm. in length, respectively. The Baculum in Microtine Rodents 2011-11-17T03:00:33.777Z Neuralgia of testis, immediately caused by local irritation. Neuralgia and the Diseases that Resemble it 2011-10-03T02:00:31.460Z Observations on males in confinement indicated that sexual activity tended to be directly proportional to the size of the testes. Aspects of Reproduction and Development in the Prairie Vole (Microtus ochrogaster) 2011-09-19T02:00:13.453Z As the breeding condition is attained, testes descend into the scrotum. Comparative Ecology of Pinyon Mice and Deer Mice in Mesa Verde National Park, Colorado 2012-02-24T03:00:32.243Z The histological appearance of testes preserved in April and May is much the same. Natural History of the Ornate Box Turtle, Terrapene ornata ornata Agassiz 2011-10-01T02:00:30.200Z The testis t occupies a median position in the coiled visceral mass. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 5 "Gassendi, Pierre" to "Geocentric" 2011-09-02T02:00:20.450Z Spermatogenesis, the formation of spermatozoa in the testis, 13. The Biological Problem of To-day Preformation Or Epigenesis? The Basis of a Theory of Organic Development 2011-08-29T02:01:04.170Z On several occasions large males having enlarged testes were not readily rebuffed by females but continued to follow them. Aspects of Reproduction and Development in the Prairie Vole (Microtus ochrogaster) 2011-09-19T02:00:13.453Z Soon the testes and their accessory organs enlarge and are readily apparent. Comparative Ecology of Pinyon Mice and Deer Mice in Mesa Verde National Park, Colorado 2012-02-24T03:00:32.243Z The testes of specimens that were nearly mature contained primary and secondary spermatocytes but lacked lumina; it was thought that such individuals would have matured in the following summer and bred in the following autumn. Natural History of the Ornate Box Turtle, Terrapene ornata ornata Agassiz 2011-10-01T02:00:30.200Z Entoconcha, body elongated and tubular, animal fixed by the oral extremity, protandric hermaphrodite, parasitic in testes of Holothurians causing their abortion. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 5 "Gassendi, Pierre" to "Geocentric" 2011-09-02T02:00:20.450Z The molt and testis cycle of the Anna hummingbird. The Breeding Birds of Kansas 2011-08-27T02:00:24.797Z In confinement only those males having markedly enlarged scrotal testes showed interest in females that were in oestrus. Aspects of Reproduction and Development in the Prairie Vole (Microtus ochrogaster) 2011-09-19T02:00:13.453Z Captive pairs of both species yielded no evidence of reproductive activity until January when, as mentioned earlier, some of the males had scrotal testes. Comparative Ecology of Pinyon Mice and Deer Mice in Mesa Verde National Park, Colorado 2012-02-24T03:00:32.243Z Recession of testes in spring was coincident with the period of active breeding; increase in size, later in the season, corresponded to increasing spermatogenic activity and enlargement of seminiferous tubules. Natural History of the Ornate Box Turtle, Terrapene ornata ornata Agassiz 2011-10-01T02:00:30.200Z The male reproductive system is but little known, a small gland lying between the ovaries has been thought to be a testis, and if it be, the Gastrotricha are hermaphrodite. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 5 "Gassendi, Pierre" to "Geocentric" 2011-09-02T02:00:20.450Z It is well known that the hormones estrogen and testosterone, produced in the ovaries and testes, help to regulate bone growth. In Theory: Examining the Mystery of Skeleton, Sugar and Sex 2011-08-22T22:51:20Z Go mano-a-mano against a chimpanzee and the chimp wins, hands down – and fingers, testes and face off. In A Contest of Chimp Versus Man, Is Language Allowed? ...and My New Book, Harnessed. 2011-08-17T15:46:02Z In both species testes of wild males caught in autumn after late September and on through the winter were abdominal, except for one male of P. maniculatus which had enlarged, scrotal testes on October 15. Comparative Ecology of Pinyon Mice and Deer Mice in Mesa Verde National Park, Colorado 2012-02-24T03:00:32.243Z A male that I examined had one atrophied testis. Natural History of the Ornate Box Turtle, Terrapene ornata ornata Agassiz 2011-10-01T02:00:30.200Z They then transplanted these cells into the testes of infertile male mice -- which apparently went on to produce healthy sperm. Experts grow mouse sperm to help with human infertility 2011-08-05T06:45:48Z Early this year, Dr. Karsenty’s team published a study demonstrating that in mice a protein called osteocalcin, which is produced by bone-forming cells called osteoblasts, binds to a specific receptor on cells of the testes. In Theory: Examining the Mystery of Skeleton, Sugar and Sex 2011-08-22T22:51:20Z They would like to learn how to develop sperm completely in the laboratory instead of injecting primordial germ cell-like cells into the testes for maturation. Sperm Made (Mostly) in a Dish Produce Normal Mice 2011-08-04T17:01:00Z It was assumed that testes that have not descended, and that lie within the abdominal cavity, are not capable of producing viable sperm. Comparative Ecology of Pinyon Mice and Deer Mice in Mesa Verde National Park, Colorado 2012-02-24T03:00:32.243Z The testes are smallest in spring and largest in September. Natural History of the Ornate Box Turtle, Terrapene ornata ornata Agassiz 2011-10-01T02:00:30.200Z The progestin tricks the brain into signaling the testes to stop producing testosterone, which in turn stops the production of sperm. Male Birth Control Could Soon Be a Reality. But Would Men Use It? 2011-07-27T11:30:48Z With progestin, the brain signals the testes to stop producing testosterone, arresting sperm production. The Search for a Male Contraceptive That Men Might Not Mind 2011-07-23T20:29:40Z The protein is normally secreted by the epididymis, where sperm are stored after they are produced in the testes. Study Links Male Infertility to a Missing Protein 2011-07-21T03:30:55Z Toward the beginning and end of the breeding season the testes and accessory organs of wild mice were small and probably produced few if any sperm. Comparative Ecology of Pinyon Mice and Deer Mice in Mesa Verde National Park, Colorado 2012-02-24T03:00:32.243Z In another male both testes were shrunken and discolored and appeared to be encased by fibrous tissue. Natural History of the Ornate Box Turtle, Terrapene ornata ornata Agassiz 2011-10-01T02:00:30.200Z When I examined the “scrotal sac” of Dionysus this week, the masses of fat and connective tissue were so turgid that I thought I was palpating real testes. Scientist at Work: Male or Female? Good Question! 2011-06-29T11:28:43Z Another involves briefly heating the testes with ultrasound, which can halt sperm production for months, she said. The Search for a Male Contraceptive That Men Might Not Mind 2011-07-23T20:29:40Z While Lupron mainly blocks production of testosterone by the testes, there is still some hormone produced by the adrenal gland or even by the tumor itself. New Drugs Fight Prostate Cancer, but at High Cost 2011-06-28T01:19:53Z At these times some males apparently were so frightened by being handled that the testes were retracted into the inguinal canals. Comparative Ecology of Pinyon Mice and Deer Mice in Mesa Verde National Park, Colorado 2012-02-24T03:00:32.243Z The ovaries and testes are borne on the endocyst, not in connection with the funiculus. Freshwater Sponges, Hydroids & Polyzoa 2011-06-25T02:00:17.833Z Adult males with enlarged testes were obtained on July 11 and August 10, and three juveniles were taken southwest of Sisal on August 10, 16, and 18. Summer Birds From the Yucatan Peninsula 2011-06-21T02:00:27.783Z Other agents being investigated, including gamendazole and adjudin, target the Sertoli cells within the testes that provide crucial nourishment to growing sperm. Beyond Condoms: The Long Quest for a Better Male Contraceptive 2011-06-14T11:15:00.307Z The presence of the testes in the body cavity does not mean that a vole is not in breeding condition, for many specimens with abdominal testes were fecund. Natural History of the Prairie Vole (Mammalian Genus Microtus) [KU. Vol. 1 No. 7] 2011-06-01T02:00:28.617Z It would have been easy to consider such males as having abdominal testes when in fact they did not. Comparative Ecology of Pinyon Mice and Deer Mice in Mesa Verde National Park, Colorado 2012-02-24T03:00:32.243Z Neither the ovaries nor the testes have any fixed position on the lateral walls of the zoœcium to which they are confined. Freshwater Sponges, Hydroids & Polyzoa 2011-06-25T02:00:17.833Z Males collected in July and August had enlarged testes; a juvenile, barely able to fly, was taken on August 14. Summer Birds From the Yucatan Peninsula 2011-06-21T02:00:27.783Z The testes are inside the abdomen in each group. Remarkable Creatures: A Lesson of Genealogy: Looks Can Be Deceiving 2011-05-23T21:43:17Z There is a relationship almost positive between the size of the tubules of the cauda epididymis and the length of the testes. Natural History of the Prairie Vole (Mammalian Genus Microtus) [KU. Vol. 1 No. 7] 2011-06-01T02:00:28.617Z In such cases the scrotum usually was noticeably enlarged; it was found also that in many cases the testes returned to the scrotal position if the mouse was held gently for a few minutes. Comparative Ecology of Pinyon Mice and Deer Mice in Mesa Verde National Park, Colorado 2012-02-24T03:00:32.243Z The ovary develops at the end of the upper, the testis at that of the lower funiculus. Freshwater Sponges, Hydroids & Polyzoa 2011-06-25T02:00:17.833Z My only specimen has nearly fully enlarged testes. Summer Birds From the Yucatan Peninsula 2011-06-21T02:00:27.783Z The BBC described the scientists' technique: Rather than working with individual cells, the team in Japan used fragments of testes. Can Test Tube Sperm Rescue Infertile Men? 2011-03-26T17:01:29Z The testes of the prairie vole descend into the scrotum in the breeding season. Natural History of the Prairie Vole (Mammalian Genus Microtus) [KU. Vol. 1 No. 7] 2011-06-01T02:00:28.617Z Retraction of the testes from the scrotum was not a problem at the height of the breeding season when the testes were engorged. Comparative Ecology of Pinyon Mice and Deer Mice in Mesa Verde National Park, Colorado 2012-02-24T03:00:32.243Z Switching to human testis samples may present its own set of challenges, too. Making Sperm in a Petri Dish 2011-03-23T19:35:24Z Information on the condition of the testes refers to the left testis unless otherwise noted. Summer Birds From the Yucatan Peninsula 2011-06-21T02:00:27.783Z The sperm changes traced back to a reduced proliferation of Sertoli cells in the fetal testes. Low Sperm Counts Linked to Fetal Effects 2011-03-04T15:35:00Z They found that the sperm-producing tissue lining gorillas' testes was much thinner than that of orangutans and chimpanzees. Promiscuous apes make more sperm 2011-02-16T02:31:40Z Subadults: Subadult pelage having mostly replaced juvenal pelage; mice often as large as adults; testes of males often abdominal in breeding season; gray juvenal pelage may persist on head of some individuals. Comparative Ecology of Pinyon Mice and Deer Mice in Mesa Verde National Park, Colorado 2012-02-24T03:00:32.243Z The cultured testes kept making sperm for two more months, the team reports online today in . Making Sperm in a Petri Dish 2011-03-23T19:35:24Z The only evidence of breeding was slightly enlarged testes in one male. Summer Birds From the Yucatan Peninsula 2011-06-21T02:00:27.783Z Practically any organ or tissue may be attacked, excepting, apparently, the testis and cartilage and bone. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z For these three species of ape, the scientists have now proven that testes size is proportionate to sperm production. Promiscuous apes make more sperm 2011-02-16T02:31:40Z The left testis of a male obtained on August 10 seemed enlarged, indicating possible sexual activity, and measured approximately 6 x 2 mm. Some Reptiles and Amphibians from Korea 2011-01-15T03:00:35.760Z In reptiles and birds they are long lobulated bodies lying close to the testis or ovary and receiving an adrenal portal vein. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 8 "Dubner" to "Dyeing" 2010-12-26T03:00:17.840Z A male taken on July 31 had enlarged testes. Summer Birds From the Yucatan Peninsula 2011-06-21T02:00:27.783Z Further, human testes and sperm cells are known to carry vitamin D receptors, along with enzymes that metabolize the vitamin, suggesting that vitamin D might play a role in the production and maturation of sperm. Low vitamin D not linked to semen quality 2010-12-10T20:27:00Z Previous studies proposed that testes are smaller in polygynous species such as gorillas where one alpha male monopolises mating with multiple females. Promiscuous apes make more sperm 2011-02-16T02:31:40Z The reassignment surgery removed her testes, and her hormones and muscle strength are in line with someone who was genetically female, she said. Transgender Golfer Sues L.P.G.A. Over Policy 2010-10-13T00:50:00Z Sure enough, theprotein encoded by the gene was found only in mouse testes. Animal Sperm Arose Once 2010-07-16T14:49:00Z Icterus cucullatus Nelson: Hooded Oriole.—This species has not heretofore been recorded as breeding on Isla Cozumel; testes were nearly fully enlarged but probably regressing in the only specimen taken there. Summer Birds From the Yucatan Peninsula 2011-06-21T02:00:27.783Z Protruding body parts, such as testes and ears, were particularly vulnerable, Amsler said. Study from Uganda says chimpanzees attack neighbors to expand their domain 2010-07-06T04:00:00Z Visual observations confirmed that chimpanzees have larger testes compared to their body size than gorillas but it was not clear whether they actually produced more sperm. Promiscuous apes make more sperm 2011-02-16T02:31:40Z But I want you to know that my life blows major testes these days. Gary Shteyngart: “Kokiri.” 2010-06-07T04:00:00Z Dr Shah could not find them earlier in development either, such as just after the fetal testes first started putting out testosterone in a 13-day-old embryo. Behaviour of the sexes: The hormone of laddishness 2010-04-29T11:22:00Z Two males taken in late July had fully enlarged testes. Summer Birds From the Yucatan Peninsula 2011-06-21T02:00:27.783Z There are other projects on temporarily shutting down sperm production in the testes. A Conversation With Alan Guttmacher: Child Health Director Has Background in Genetics 2010-04-26T22:10:00Z Often the internal testes are removed later in life as they can be prone to malignancy. 2010-02-15T14:55:00Z The ovaries and testes are saccular organs arranged in a row along the gill and succeeding region. Journal of Entomology and Zoology Volume Eleven, Number Two, June 1919 The specific name altipotens is Latin, meaning mighty, here used in allusion to the supposed potentiality of fertilization by the production of vast quantities of sperm in the large testes. Descriptions of New Hylid Frogs From Mexico and Central America The same is true with regard to fathers who have, by accident or disease, lost one of the testes, and have subsequently become the fathers of both boys and girls. What a Young Husband Ought to Know Seasonal change in the size of testes in adult males is indicated by the following data: June 3, 30×18 mm.; The Barren Ground Caribou of Keewatin Most press reports claim that Semenya has testosterone levels three times higher than average and that she also has testes. 2010-02-15T14:55:00Z The ovary and testes are heaped-up masses of red or yellow cells due to a proliferation of the cells lining the coelom. Encyclopaedia Britannica, 11th Edition, Volume 4, Slice 3 "Borgia, Lucrezia" to "Bradford, John" The testes in all adult males are granular, ovoid in shape, and greatly enlarged. Descriptions of New Hylid Frogs From Mexico and Central America Respective lengths of testes were 30, 36, and 15. Mammals of Northwestern South Dakota A similar though perhaps a slower effect is produced when the duct of the testis, the vas deferens, is divided on each side of the body. Encyclopaedia Britannica, 11th Edition, Volume 4, Slice 1 "Bisharin" to "Bohea" The testes are more numerous than the ovaries, of which latter there are never more than one pair. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 7 "Cerargyrite" to "Charing Cross" In the male of Scolopendra, on the contrary, there are as many as twelve pairs of somewhat sausage-shaped testes, approximated two by two. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 6 "Celtes, Konrad" to "Ceramics" |
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