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Yolk sac
The yolk sac in man contains no nutrients so in this aspect is vestigial. However, the its embryonic endodermal roof is the source of the mucous membrane of almost the entire intestinal tract. The yolk sac also is concerned with the transfer of nutritive fluid to the embryo from the trophoblast, primary mesenchyme and extra-embryonic coelem.
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- Part of Speech: noun
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- Industry/Domain: Anatomy
- Category: Developmental anatomy
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