Human Health Exposure Analysis Resource

Last uploaded: July 19, 2024
Id http://purl.obolibrary.org/obo/UBERON_0001040
http://purl.obolibrary.org/obo/UBERON_0001040
Preferred Name

yolk sac

Definitions
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].
Synonyms
vesicula umbilicalis
saccus vitellinus
Type http://www.w3.org/2002/07/owl#Class
Delete Subject Author Type Created
No notes to display