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 WordNet Dictionary |
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| | Definition: | |
- [n] membranous structure enclosing the yolk of eggs in birds reptiles marsupials and some fishes; circulates nutrients to the developing embryo
- [n] membranous structure that functions as the circulatory system in mammal embryos until the heart becomes functional
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| | Synonyms: | | umbilical vesicle, vesicula umbilicus, vitelline sac |
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| | See Also: | | sac |
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| Glossary |
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| | Definition: | | a sack formed from embryonic tissue in the amniote egg that contains yolk. |
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