Term Name:	visceral yolk sac
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]