Term Name: | visceral yolk sac |
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Synonyms: | secondary yolk sac, umbilical vesicle, vitelline sac, yolk sac |
Definition: | extraembryonic tissue membrane, formed from the visceral endoderm and the extraembryonic mesoderm, which is located ventral to the embryonic disc and is connected to the presumptive midgut of the embryo; the yolk that it contains is the site of embryonic hematopoiesis and vitelline circulation is involved in early embryonic circulation; it is the origin of the primordial germ cells |
Ontology: | Uberon Ontology [UBERON:0008852] |