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