umbilical vesicle

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Noun1.Umbilical vesicle - membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functionalumbilical vesicle - membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional
vesicula umbilicus, vitelline sac, yolk sac
sac - a structure resembling a bag in an animal
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