vitelline sac
1 definition found
vitelline sac - WordNet (r) 2.1 (2005) :
vitelline sac
n 1: membranous structure that functions as the circulatory
system in mammalian embryos until the heart becomes
functional [syn: yolk sac, vitelline sac, umbilical vesicle
, vesicula umbilicus]
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