Lexic.us

Definition of Yolk sac

1. Noun. Membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional.

2. Noun. Membranous structure enclosing the yolk of eggs in birds, reptiles, marsupials, and some fishes; circulates nutrients to the developing embryo.

Definition of Yolk sac

1. Noun. (anatomy) A membranous sac attached to an embryo, providing early nourishment in the form of yolk in bony fishes, sharks, reptiles, birds, and primitive mammals. ¹

¹ Source: wiktionary.com

Medical Definition of Yolk sac

1. 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)

Lexicographical Neighbors of Yolk Sac

yokking yokozuna yokozunas yoks yokul yold yolden yoldring yoldrings yolk

yolk cell yolk cells yolk cleavage yolk membrane yolk plug yolk sac (current term) yolk sac carcinoma yolk sac tumour yolk stalk yolked

yolkier yolkiest yolks yolky yom yomim yomp yomped yomping yomps

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