Examlex
Which region of the brain contains two ventricles?
Yolk Sac
An extra-embryonic membrane that provides nutrients to the early embryo; it is a critical structure in the development of many vertebrates.
Chorion
The outermost fetal membrane in many vertebrates, including humans, contributing to the formation of the placenta.
Amnion
A thin but tough sac of membrane that encloses the embryo or fetus in the uterus, containing the amniotic fluid.
Allantois
An embryonic membrane involved in gas exchange and waste removal in the development of the embryo.
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