The chorion is the outermost fetal membrane around the embryo in mammals, birds and reptiles (amniotes). It is also present around the embryo of other animals, like insects and molluscs.

Oct 30, 2023 · The chorion is the outermost of the four membranes surrounding the developing fetus, consisting of trophoblast and underlying extraembryonic mesoderm. It is continuous with the lining of …

Feb 26, 2018 · The chorion, on the other hand, is the outer membrane that surrounds the amnion, the embryo, and other membranes and entities in the womb. It is considered as the support platform of …

chorion, in reptiles, birds, and mammals, the outermost membrane around the embryo. It develops from an outer fold on the surface of the yolk sac. In insects the chorion is the outer shell of the insect egg.

Apr 28, 2023 · The chorion is the outermost membrane that surrounds the developing embryo, while the amnion is a fluid-filled sac that surrounds the embryo and helps to protect it from mechanical shock …

Jul 24, 2025 · During pregnancy, two protective membranes, the chorion and the amnion, develop around the growing embryo and fetus. These membranes work together to form the amniotic sac, a …

About two-thirds of identical twins have the same chorion (and thus are called monochorionic monozygotic twins), and about one-third have their own chorion (and thus are called dichorionic …