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 ...

The focus of this review is on the embryology, anatomy and physiology of seven distinct entities of the fetal environment: the cervix, uterus, placenta, fetal membranes chorion and amnion ...

(The chorion is the membrane that develops into the placenta, and the amnion is the amniotic sac.) Di-di twins make up 70% of all twin pregnancies. "Di-di twins carry the lowest risk of all ...