The chorion is an outer fetal membrane in amniotic eggs, including those of reptiles. It plays a crucial role in gas exchange between the embryo and the external environment.
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The chorion lies just beneath the eggshell and works in conjunction with the allantois for respiratory functions.
It helps facilitate the exchange of oxygen and carbon dioxide between the embryo and its surroundings.
In reptiles, the chorion is part of a complex system that allows development within an egg laid on land.
The chorion can fuse with other membranes, such as the allantois, to form structures like the chorioallantoic membrane.
It provides structural support to the developing embryo by maintaining integrity during gestation.