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.

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 …

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 …

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 …

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 …

The chorion is one of the membranes that develop from the outermost layer of cells in the embryo, known as the trophoblast, surrounding the embryo and forming part of the placenta. It plays a …

Mar 2, 2024 · Chorion is a vital membrane that plays a key role in the development of eggs. This protective layer surrounds the embryo and provides essential nutrients for its growth. …

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 …

Jun 14, 2025 · The chorion is the outermost membrane surrounding the embryo, formed from the trophoblast and the extraembryonic mesoderm. It develops from the cytotrophoblast and …

The meaning of CHORION is the highly vascular outer embryonic membrane of reptiles, birds, and mammals that in placental mammals is associated with the allantois in the formation of the …