Chorioallantoic membrane

Chorioallantoic membrane
The chorioallantoic membrane of a developing chick covered with Smallpox virus pocks
Identifiers
MeSHD049033
Anatomical terminology

The chorioallantoic membrane (CAM), also known as the chorioallantois, is a highly vascularized membrane found in the eggs of certain amniotes like birds and reptiles. It is formed by the fusion of the mesodermal layers of two extra-embryonic membranes – the chorion and the allantois. It is the avian homologue of the mammalian placenta. It is the outermost extra-embryonic membrane which lines the non-vascular egg shell membrane.

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