Slideshows Images Quizzes

Copyright © 2018 by RxList Inc. RxList does not provide medical advice, diagnosis or treatment. See additional information.

Definition of Yolk sac

Reviewed on 3/29/2021

Yolk sac: A membrane outside the human embryo that is connected by a tube (the yolk stalk) though the umbilical opening to the embryo's midgut. The yolk sac serves as an early site for the formation of blood and in time, is incorporated into the primitive gut of the embryo

SLIDESHOW

13 Early Signs & Symptoms of Pregnancy See Slideshow

Health Solutions From Our Sponsors