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Definitions:
Noun
yolk sac
vitelline sac
umbilical vesicle
vesicula umbilicus
Definition: membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional
yolk sac
Definition: membranous structure enclosing the yolk of eggs in birds, reptiles, marsupials, and some fishes; circulates nutrients to the developing embryo
Definition: A membranous sac attached to an embryo, providing early nourishment in the form of yolk in bony fishes, sharks, reptiles, birds, and primitive mammals.