| 单词 | chorion |
| 例句 | While the inner amniotic membrane surrounds the embryo itself, the chorion surrounds the embryo and yolk sac. Fundamentals of Biology 2015-01-01T00:00:00Z Blood cells and vessel production in structures outside the embryo proper called the yolk sac, chorion, and connecting stalk begin about 15 to 16 days following fertilization. Anatomy and Physiology 2013-06-19T00:00:00Z The surface of the chorion is covered evenly with minute villi, constituting a diffuse non-deciduate placenta. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 6 "Home, Daniel" to "Hortensius, Quintus" 2012-03-15T02:00:32.250Z 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 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 The chorion facilitates exchange of oxygen and carbon dioxide between the embryo and the egg’s external environment. Fundamentals of Biology 2015-01-01T00:00:00Z The mechanism of gas exchange at the chorion is similar to gas exchange at the respiratory membrane. Anatomy and Physiology 2013-06-19T00:00:00Z Exochorion: that part of the chorion derived from the ectoderm: the outer layer of the chorion. Explanation of Terms Used in Entomology The chorion is an outward skin which compasseth the child in the womb. The Works of Aristotle the Famous Philosopher Containing his Complete Masterpiece and Family Physician; his Experienced Midwife, his Book of Problems and his Remarks on Physiognomy The chorion is the outer envelope or membrane of the fetus, completely inclosing the fetus with its other membranes. Special Report on Diseases of Cattle 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 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 The external envelope, the chorion, is exactly adapted to the uterus. Common Diseases of Farm Animals The first thing that is formed is the amnios; the next the chorion; and they enwrap the seed round like a curtain. The Works of Aristotle the Famous Philosopher Containing his Complete Masterpiece and Family Physician; his Experienced Midwife, his Book of Problems and his Remarks on Physiognomy 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 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 The last of the extra-embryonic membranes is the chorion, which is the one membrane that surrounds all others. Anatomy and Physiology 2013-06-19T00:00:00Z 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 Here again the whole surface of the chorion is thickly covered with the villi in the beginning. The Evolution of Man — Volume 2 When the allantois has attached itself to the inner wall of the chorion and been converted into the placenta, its blood-vessels alone effect the nourishment of the embryo. The Evolution of Man — Volume 1 The chorionic villi of the chorion extend into the endometrium to form the fetal portion of the placenta. Anatomy and Physiology 2013-06-19T00:00:00Z The development of the chorion will be discussed in more detail shortly, as it relates to the growth and development of the placenta. Anatomy and Physiology 2013-06-19T00:00:00Z But very soon, even in the first week of development, this is replaced by the permanent chorion. The Evolution of Man — Volume 1 When we open the chorion of a human embryo of three weeks, we find on the ventral side of the foetus a large round sac, filled with fluid. The Evolution of Man — Volume 1 But in the third sub-class of the mammals the serolemma forms, by invagination at its outer surface, a number of hollow tufts or villi, from which it takes the name of the chorion or mallochorion. The Evolution of Man — Volume 1 Within the outer chorion the tiny curved foetus lies on the large embryonic vesicle, to the left above. The Evolution of Man — Volume 1 These form the chorionic membrane, which envelops the entire conceptus as the chorion. Anatomy and Physiology 2013-06-19T00:00:00Z As a large quantity of fluid gathers inside it, the chorion expands more and more, so that the embryo only occupies a small part of the space within the vesicle. The Evolution of Man — Volume 1 The villi of the chorion grow larger and more numerous. The Evolution of Man — Volume 1 The outer envelope of the whole ovum is the chorion, thickly covered with its branching villi, a product of the serous membrane. The Evolution of Man — Volume 1 Human embryo of the fourth week, one-third of an inch long, lying in the dissected chorion. The Evolution of Man — Volume 1 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 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 In this case there is at an early stage an intimate blending of the chorion of the embryo and the part of the mucous lining of the womb to which it attaches. The Evolution of Man — Volume 1 The gut-fibre layer of the allantois, richly supplied with branches of the umbilical vessel, presses into these tufts of the primary chorion, and forms the "secondary chorion." The Evolution of Man — Volume 1 |
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