YOLKSAC

Yolk sac

The yolk sac is a membranous sac attached to an embryo, providing early nourishment in the form of yolk in bony fishes, sharks, reptiles, birds, and primitive mammals. It functions as the developmental circulatory system of the human embryo, before internal circulation begins.

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yolk sac

Noun

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


The above text is a snippet from Wiktionary: yolk sac
and as such is available under the Creative Commons Attribution/Share-Alike License.

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