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See fetal membrane.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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
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