Back مشيماء Arabic Horion BS Cori Catalan Chorion Czech Chorion German Corion Spanish Kõldkest Estonian Korion Basque کوریون Persian Chorion French
| Chorion | |
|---|---|
 Diagram showing the chorion of a chicken egg | |
 Human fetus enclosed in the amnion | |
| Details | |
| Identifiers | |
| Latin | chorion |
| MeSH | D002823 |
| TE | E5.11.3.1.1.0.3 |
| Anatomical terminology | |
The chorion is the outermost fetal membrane around the embryo in mammals, birds and reptiles (amniotes). It develops from an outer fold on the surface of the yolk sac, which lies outside the zona pellucida (in mammals), known as the vitelline membrane in other animals. In insects, it is developed by the follicle cells while the egg is in the ovary.[1] Some mollusks also have chorions as part of their eggs. For example, fragile octopus eggs have only a chorion as their envelope.[2]
- ^ Chapman, R.F. (1998) "The insects: structure and function", Section The egg and embryology. Previewed in Google Books [1] on 26 Sep 2009.
- ^ “The Octopoda are characterized by eggs that have only a chorion as an envelope”https://www.sciencedirect.com/topics/agricultural-and-biological-sciences/octopoda
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