yolk sac

saccus vitellinus

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].

类型 Organ
上级结构 extraembryonic tissue
拉丁名称 saccus vitellinus
FMA ID 87180

下级结构

parietal yolk sac Organ visceral yolk sac Organ

常见问题

What is the yolk sac?
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 circul
What is the Latin name for the yolk sac?
The Latin name for the yolk sac is saccus vitellinus.

相关结构

mucus body coating mucous body coating mucus cocoon mucous cocoon Mullerian duct ductus paramesonephricus multi cell part structure cell part cluster multicellular anatomical structure multicellular structure multilaminar epithelium laminated epithelium multi-tissue structure multi-tissue structures multi-unit eye

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Data sources: Terminologia Anatomica, Foundational Model of Anatomy, Wikidata.