What is an Yolk sac?
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Yolk Sac is a membranous bound structure that contains important nourishment for the developing foetus in humans. It provides nourishment in first 3 months then it disappear.
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yolk sac
The yolk sac is a membranous sac attached to an embryo, formed by cells of the hypoblast adjacent to the embryonic disk. This is alternatively called the umbilical vesicle by the Terminologia Embryologica (TE), though yolk sac is far more widely used.
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