yolk sac

Term ID

UBERON:0001040

Synonyms

• saccus vitellinus
• vesicula umbilicalis

Definition

A sac-like expansion of the ventral wall of the intestine, narrowed into a yolk stalk near the body[Hyman's]. Membranous sac attached to an embryo, providing early nourishment in the form of yolk in bony fishes, sharks, reptiles, birds, and primitive mammals. It functions as the developmental circulatory system of the human embryo, before internal circulation begins. In the mouse, the yolk sac is the first site of blood formation, generating primitive macrophages and erythrocytes[WP]. http://en.wikipedia.org/wiki/Yolk_sac

References

• BTO:0001471
• CALOHA:TS-1130
• EFO:0003078
• EHDAA2:0002212
• EHDAA:164
• EMAPA:16085
• GAID:1301
• MESH:A16.254.403.981
• NCIT:C14128
• UMLS:C0043425
• VHOG:0000830
• Yolk:sac
• http://linkedlifedata.com/resource/umls/id/C0043425
• http://www.snomedbrowser.com/Codes/Details/362845002

Ontology

Cell Ontology