Outermost fetal membrane around the embryo in amniotes
For the entertainment company, see Chorion (company).
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
[edit on Wikidata]
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
monotremes), the chorion is one of the fetal membranes that exist during pregnancy between the developing fetus and mother. The chorion and the amnion together...
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diameter varies from 1 mm to 5 mm; it is situated between the amnion and the chorion and may lie on or at a varying distance from the placenta. There is no...
protective environment for the developing embryo. The amnion, along with the chorion, the yolk sac and the allantois protect the embryo. In birds, reptiles...
containing the amniotic fluid and the embryo. The outer membrane, the chorion, contains the amnion and is part of the placenta. On the outer side, the...
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