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skos:definition |
MSH: The first of four extra-embryonic membranes to form during EMBRYOGENESIS. In REPTILES and BIRDS, it arises from endoderm and mesoderm to incorporate the EGG YOLK into the DIGESTIVE TRACT for nourishing the embryo. In placental MAMMALS, its nutritional function is vestigial; however, it is the source of INTESTINAL MUCOSA; BLOOD CELLS; and GERM CELLS. It is sometimes called the vitelline sac, which should not be confused with the VITELLINE MEMBRANE of the egg.,NCI: Membranous sac on the ventral aspect of the developing embryo that acts as a primitive circulatory system as well as providing nourishment. (NCI),CSP: sometimes called vitelline sac; do not confuse with vitelline membrane of the egg; an embryonic membrane formed from endoderm and mesoderm; in reptiles and birds it incorporates the yolk into the digestive tract for nourishing the embryo; in placental mammals it is the source of most of the intestinal mucosa and the site of formation of the germ cells.,NCI: Membranous sac on the ventral aspect of
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