MeSH definition : The outermost extra-embryonic membrane surrounding the developing embryo. In REPTILES
and BIRDS, it adheres to the shell and allows exchange of gases between the egg and
its environment. In MAMMALS, the chorion evolves into the fetal contribution of the
PLACENTA.;
MeSH synonym : chorions;
Wikipedia link : https://en.wikipedia.org/wiki/Chorion;
The outermost extra-embryonic membrane surrounding the developing embryo. In REPTILES
and BIRDS, it adheres to the shell and allows exchange of gases between the egg and
its environment. In MAMMALS, the chorion evolves into the fetal contribution of the
PLACENTA.