#amnion__amniotic_sac__amnios thin innermost membranous sac enclosing the developing embryo in higher vertebrates (Amniota: reptiles; birds; mammals)
supertype: #sac a structure resembling a bag in an animal
part of: #fetal_membrane__fetalmembrane any membrane that functions for the protection or nourishment of respiration or excretion of a developing fetus
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