| 单词 | amnion |
| 例句 | This is how it is at the end – me lying in my bath while the waters break,my skin glistening with amnion, streaks of starlight. What the Water Gave Me by Pascale Petit 2011-01-24T11:00:58Z If the answer is yes, a branch leads upward to another question: does the egg have amnion? Fundamentals of Biology 2015-01-01T00:00:00Z Based on this phylogeny, a student asks “Does this mean that lizards, frogs and rabbits all possessed hair and an egg with amnion at some point in their evolution?” Biology for AP Courses 2022-06-09T00:00:00Z Some grow to form the extra-embryonic membranes needed to support and protect the growing embryo: the amnion, the yolk sac, the allantois, and the chorion. Anatomy and Physiology 2013-06-19T00:00:00Z Until recently, pre-natal screening required invasive procedures such as amniocentesis, in which the fluid from the sac surrounding the foetus, the amnion, is sampled and the DNA examined for genetic abnormalities. Warning: Genetically Modified Humans 2012-10-04T13:45:00.217Z S, serosa; A, amnion; E, ectoderm; N, rudiment of nerve-cord; M, mesodermal pouches. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 4 "Hero" to "Hindu Chronology" 2012-04-04T02:00:56.447Z The amnion protects the embryo from mechanical shock and supports hydration. Fundamentals of Biology 2015-01-01T00:00:00Z That group of vertebrates which develops in its embryonic life the envelope called the amnion. Webster's Unabridged Dictionary 2012-03-24T02:00:23.513Z The amnion fills with amniotic fluid and eventually grows to surround the embryo. Anatomy and Physiology 2013-06-19T00:00:00Z The clerestory windows, covered with the amnion of sheep, admitted now and then a sickly yellow glare from the full moon, which, however, shot a beam of pure silver through the smoke-hole in the roof. A Book of Ghosts 2011-07-08T02:00:19.203Z Embryonic Membranes.—A remarkable feature in the embryonic development of most Hexapoda is the formation of a protective membrane analogous to the amnion of higher Vertebrates and known by the same term. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 4 "Hero" to "Hindu Chronology" 2012-04-04T02:00:56.447Z But we can say with comparative certainty that in our case … in this case it is the amnion which is to blame.” Royal Highness 2011-05-05T02:00:22.363Z Of or pertaining to the amnion; characterized by an amnion; as, the amniotic fluid; the amniotic sac. ÷ acid. Webster's Unabridged Dictionary 2012-03-24T02:00:23.513Z The umbilical cord is surrounded by the amnion, and the spaces within the cord around the blood vessels are filled with Wharton’s jelly, a mucous connective tissue. Anatomy and Physiology 2013-06-19T00:00:00Z The third is the chorion, forming the outer membrane which encloses the fetus, and within which is the amnion, or innermost membrane which surrounds the fetus, and between which is another membrane, called the allantois. What a Young Husband Ought to Know The embryo of a moth, a dragon-fly or a bug is invaginated into the yolk at the head end, the portion of the blastoderm necessarily pushed in with it forming the amnion. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 4 "Hero" to "Hindu Chronology" 2012-04-04T02:00:56.447Z Diagram of chick showing relations of amnion, allantois and yolk. A Critique of the Theory of Evolution The literal references to the foregoing are: am, amnion; al, allantois; v, vitellus; h, encephalon; i, eye; c, heart; f, liver; g, gizzard; ms, upper, and mi, lower member. Was Man Created? Four embryonic membranes form to support the growing embryo: the amnion, the yolk sac, the allantois, and the chorion. Anatomy and Physiology 2013-06-19T00:00:00Z The amnion, which is the innermost of the membranes surrounding the fetus, seemingly has a special office, which is to secrete the fluid technically called the amniotic. What a Young Husband Ought to Know Wheeler, however, compares with the “dorsal organ” the peculiar extra embryonic membrane or indusium which he has observed between serosa and amnion in the embryo of the grasshopper Xiphidium. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 4 "Hero" to "Hindu Chronology" 2012-04-04T02:00:56.447Z The amnion is nearest the fetus and forms a closed sac around it filled with a fluid known as liquor amnii, in which the fetus floats. Special Report on Diseases of Cattle This sac, called the amnion, is filled with a watery fluid. The Meaning of Evolution The embryo when about to hatch throws off the egg-shell and amnion in a few seconds. Our Common Insects A Popular Account of the Insects of Our Fields, Forests, Gardens and Houses As the watery condition of the blood increases with advancing pregnancy, so dropsy of the amnion is a disease of the last four or five months of gestation. Special Report on Diseases of the Horse In some midges and in caddis-flies the serosa becomes ruptured and absorbed, while the germ band, still clothed with the amnion, grows around the yolk. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 4 "Hero" to "Hindu Chronology" 2012-04-04T02:00:56.447Z In the uterus the fetus is surrounded by several membranes which are known as the amnion or inner layer, the allantois or central layer, and the chorion or outer layer. Special Report on Diseases of Cattle Around the embryo there forms a sac, the amnion filled with a fluid which serves to protect the young mammals exactly as the growing chick was protected. The Meaning of Evolution The two outer ones multiply by subdivision and form the embryonal membrane, or "amnion," which is a provisional envelope and does not assist in building up the body of the germ. Our Common Insects A Popular Account of the Insects of Our Fields, Forests, Gardens and Houses Serosa: the outer membrane that envelops the forming embryo, the amnion and the remainder of the egg. Explanation of Terms Used in Entomology The nature of the amnion will be understood by following Figures 4b, 5, and 6 on Sheet 23. Text Book of Biology, Part 1: Vertebrata The one layer of the allantois is spread over the outer surface of the amnion and the other over the inner surface of chorion. Special Report on Diseases of Cattle The embryo thus enclosed in the egg finds its protection in the fact that it is encased in a fluid contained in the amnion. The Meaning of Evolution A great step in evolution was implied in the origin of this ante-natal hood or fœtal membrane and another one—of protective significance—called the amnion, which forms a water-bag over the delicate embryo. The Outline of Science, Vol. 1 (of 4) A Plain Story Simply Told Ventral plate: a thickening of the blastoderm of an egg from which the embryo, but not the amnion or serosa is formed. Explanation of Terms Used in Entomology We find solid mesoblastic somites, we find primitive streak, allantois and amnion, features we have just been explaining as the consequence of an excess of yolk in the egg. Text Book of Biology, Part 1: Vertebrata The Dipneusta gave rise to the Amphibia, which are the root of all other Vertebrata, inasmuch as out of them were developed the first Vertebrata provided with an amnion, or the Protamniota. Critiques and Addresses The bones seemed better developed than ordinarily; the skin was thick, callous, and yellowish The chorion, amnion, and placenta were ossified and the cord dried up. Anomalies and Curiosities of Medicine The embryos of Reptiles, Birds, and Mammals all develop two embryonic or foetal membranes, the amnion and the allantois. Hormones and Heredity Amnion fold: the extensions of the amnion which close the mouth of the amnion cavity in the embryo. Explanation of Terms Used in Entomology For a clear understanding of the allantois and amnion, this last is almost indispensable. Text Book of Biology, Part 1: Vertebrata Covering the external face of the amnion and lining the inner face of the chorion is a double membrane, the allantois. Common Diseases of Farm Animals This latter portion, the veil that passes from the edge of the placenta, is formed of the two membranes we have mentioned, namely, the chorion and the amnion. The Prospective Mother, a Handbook for Women During Pregnancy Of the function or origin of the amnion little is known: to state that it is protective affords little explanation. Hormones and Heredity The ancestors of these Amniotes develop an amnion and allantois, and gradually assume the mammal, and finally the specifically human, form. The Evolution of Man — Volume 2 The ventral wall advances into the amnion, which encloses the embryo. The Evolution of Man — Volume 1 The innermost envelope, the amnion, encloses the foetus. Common Diseases of Farm Animals In this most advanced group of the mammals the allantois is very small, soon loses its cavity, and then, in common with the amnion, undergoes certain peculiar changes. The Evolution of Man — Volume 1 The embryo is already entirely enclosed in the amnion, and is only connected in the middle of the belly by the vitelline duct with the embryonic vesicle, which changes into the yelk-sac. The Evolution of Man — Volume 1 The formation of the amnion and the allantois and the complete disappearance of the gills are the chief characteristics that distinguish the Amniotes from the lower Vertebrates we have hitherto considered. The Evolution of Man — Volume 2 Two of these appendages—the amnion and the allantois—are only found in the three higher classes of vertebrates, while the third, the yelk-sac, is found in most of the vertebrates. The Evolution of Man — Volume 1 The umbilical cord goes from its navel to the placenta. b amnion, c chorion, d placenta, d apostrophe, relics of villi on smooth chorion, f internal or reflex decidua, g external or true decidua. The Evolution of Man — Volume 1 Of the three vesicular appendages of the amniote embryo which we have now described the amnion has no blood-vessels at any moment of its existence. The Evolution of Man — Volume 1 We now know from Selenka that the much-discussed ventral pedicle is merely the pedicle of the allantois, combined with the pedicle of the amnion and the rudimentary pedicle of the yelk-sac. The Evolution of Man — Volume 1 E, M, H outer, middle, and inner germ layer of the embryonic shield, which is figured in median longitudinal section, seen from the left. am amnion. The Evolution of Man — Volume 1 |
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