Definition of Vitelline sac
1. Noun. Membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional.
Medical Definition of Vitelline sac
One of the set of extra embryonic membranes, growing out from the gut over the yolk surface, in birds formed from the splanchnopleure, an outer layer of splanchnic mesoderm and an inner layer of endoderm.
This entry appears with permission from the Dictionary of Cell and Molecular Biology
(11 Mar 2008)
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