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Chorion |
Also found in: Dictionary/thesaurus, Encyclopedia, Wikipedia, Hutchinson | 0.04 sec. |
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chorion /cho·ri·on/ (kor´e-on) 1. in human embryology, the cellular, outermost extraembryonic membrane, composed of trophoblast lined with mesoderm; it develops villi, becomes vascularized by allantoic vessels, and forms the fetal part of the placenta. 2. in mammalian embryology, the cellular, outer extraembryonic membrane, not necessarily developing villi. 3. in biology, the noncellular membrane covering eggs of various animals; e.g., fish and insects.chorion´ic chorion frondo´sum the part of chorion bearing villi. chorion lae´ve the nonvillous, membranous part of the chorion. shaggy chorion , villous chorion c. frondosum.
Chorion The outermost membrane of the sac enclosing the fetus. Mentioned in: Prenatal Surgery chorion the outermost of the fetal membranes, composed of trophoblast lined with mesoderm; it develops villi, becomes vascularized by allantoic vessels, and forms the fetal part of the placenta. chorion frondosum the part of the chorion covered by villi. chorion laeve the nonvillous, membranous part of the chorion. |
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? Mentioned in | ? References in periodicals archive | |
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If the technique is adopted more widely, it could see a decrease in the number of women subjected to far more invasive procedures such as amniocentesis and chorion villus sampling (CVS) which respectively carry a 1% and 2% risk of miscarriage. Ectopia cordis and cleft sternum: Evidence for mechanical teratogenesis following rupture of the chorion or yolk sac. The trophoblast that had originally surrounded him had by now formed a near-mature placenta on one side and, on the other, a protective bubble, the chorion, that would eventually form part of Jacob's double-layered membranes. |
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