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See fetal membrane.
any of the membranes derived from embryonic tissue that lie outside the embryo, as the allantois, amnion, chorion, and yolk sac.
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|Noun||1.||embryonic membrane - the inner membrane of embryos in higher vertebrates (especially when covering the head at birth)|
fetal membrane - any membrane that functions for the protection or nourishment or respiration or excretion of a developing fetus
placenta - the vascular structure in the uterus of most mammals providing oxygen and nutrients for and transferring wastes from the developing fetus