yolk sac
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1 yolk sac
Membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional.
synoniemen: umbilical vesicle, vesicula umbilicus, vitelline sac.
Pools: pęcherzyk żółtkowy
2 yolk sac
Membranous structure enclosing the yolk of eggs in birds, reptiles, marsupials, and some fishes; circulates nutrients to the developing embryo.
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