yolk sac

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yolk sac Definition

• (n) membranous structure that functions as the circulatory system in mammal embryos until the heart becomes functional
• (n) membranous structure enclosing the yolk of eggs in birds reptiles marsupials and some fishes; circulates nutrients to the developing embryo

yolk sac Synonyms

• umbilical vesicle
• vesicula umbilicus
• vitelline sac
• yolk sac