The chorion is the outer membrane that encloses the embryo in reptiles, birds, and mammals. It is one of four fetal membranes which includes the allantois, amnion, chorion, and yolk sac. The function of the chorion is to contribute to the development of the placenta in placental mammals.
The main function of the placenta is to move oxygenated blood into the bloodstream of the developing baby and in turn, move carbon dioxide out. It also ensures that nutrients are received, and wastes are taken away. It also plays a very important role in hCG production and protects the baby from infection.
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