Definitions of yolk sac
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membranous structure enclosing the yolk of eggs in birds, reptiles, marsupials, and some fishes; circulates nutrients to the developing embryo
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type of:
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sac
a structure resembling a bag in an animal
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sac
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membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional
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synonyms:
umbilical vesicle, vesicula umbilicus, vitelline sac
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type of:
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sac
a structure resembling a bag in an animal
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sac
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