yolksac

yolksac
yolk sac n.
A membranous sac attached to an embryo, providing early nourishment in the form of yolk in bony fishes, sharks, reptiles, birds, and primitive mammals and functioning as the circulatory system of the human embryo before internal circulation begins.

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Universalium. 2010.

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Look at other dictionaries:

  • Vitelline arteries — Infobox Embryology Name = PAGENAME Latin = GraySubject = GrayPage = Caption = Model of human embryo 1.3 mm. long. (Vitelline arteries not shown, but vitelline arteries labeled at center left.) Caption2 = System = CarnegieStage = 13 Days = 28… …   Wikipedia

  • placentotrophic live bearer — a reproductive guild (q.v.) where eggs, embryos and juveniles develop within the maternal reproductive system. Food and gas exchange is via a yolksac placenta, a buccal and branchial placenta, or follicular and trophataenial placenta, e.g.… …   Dictionary of ichthyology

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