chorioallantois
/ˌkɔrioʊəˈlæntoʊɪs/
noun
- A membrane formed by the fusion of the chorion and allantois in the eggs of reptiles, birds, and some mammals, serving functions such as gas exchange and waste storage for the embryo.
- The chorioallantois is essential for the survival of the chick inside the egg.
- In mammals, the chorioallantois contributes to the formation of the placenta.
- The chorioallantois allows the embryo to breathe through the eggshell.
Synonyms