yolk sac
Meaning
A membranous sac attached to an embryo, providing early nourishment in the form of yolk in bony fishes, sharks, reptiles, birds, and primitive mammals.
Synonyms
vitelline sac
umbilical vesicle
vesicula umbilicus
yolk-sac
vitellus capsule
Dottersack
sac vitellin
feto
feto
Notes
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