The yolk sac mesoderm originates in the extraembryonic mesoderm and forms the outer layer of the yolk sac membrane. It is a highly vascularized layer, and gives rise to blood islands which are the site of extraembryonic hematopoiesis. Additionally, primordial germ cells can be found in this layer of the yolk sac.
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Multiple AncestorsSingle AncestorNo DescendantsDevelops fromPart of Parent