umbilical vesicle

Medical Dictionary

umbilical vesicle n.
See yolk sac.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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umbilical vesicle

membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional [syn: yolk sac
WordNet® 3.0, © 2006 by Princeton University.
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