The fetal membranes consist of the chorion, amnion, yolk sac, and allantois. The chorion has three layers: cytotrophoblastic, chorionic connective tissue, and basement membrane. The chorion lies ...

The amnion and chorion develop together as upwardly projecting amniotic folds, eventually closing over the dorsal surface of the embryo. Eventually the free edges of the folds fuse and completely ...

The amnion and chorion develop together as upwardly projecting amniotic folds, eventually closing over the dorsal surface of the embryo. Eventually the free edges of the folds fuse and completely ...

The amnion (single arrow) is the inner lining of the membranes. The double arrows mark the junction of the cellular layer of the chorion and the connective tissue layer of the chorion. To the ...