MEANING OF YOLK SAC

MEANING OF YOLK SAC

yolk sac (vitelline sac) the membranous sac, composed of mesoderm lined with   endoderm,   that   lies   ventral   to   the   embryo.   It   is   one   of    the *extraembryonic membranes. Its initially wide communication with the future gut is later reduced to a narrow duct passing through the *umbilicus. It probably assists in transporting nutrients to the early embryo and is one of the first sites where blood cells are formed.

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