(embryology) The cavity in the extraembryonic mesoderm; it is continuous with the embryonic coelom in the region of the umbilicus, and is obliterated by growth of the amnion.
extraembryonic coelom
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 | Allantois (developmental biology) |
| Chorion (developmental biology) |
| Extraembryonic coelom |
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Mentioned in
- Allantois (developmental biology)
- Chorion (developmental biology)
- Extraembryonic coelom
- Heuser's membrane
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