| Extraembryonic coelom | |
|---|---|
| Carnegie stage | 6a |
| Days | 12 |
| Precursor | Heuser's membrane |
The extraembryonic coelom (or Chorionic cavity) is a portion of the conceptus consisting of a cavity between Heuser's membrane and the Trophoblast.
During formation of the primitive yolk sac, some of the migrating Hypoblast cells transdifferentiate into mesenchymal cells that fill the space between Heuser's membrane and the Trophoblast, forming the extraembryonic mesoderm . As development progresses, small lacunae begin to form within the extraembryonic mesoderm which become larger and form the extraembryonic coelom.
It divides the extraembryonic mesoderm into two layers: extraembryonic splanchnopleuric mesoderm and extraembryonic somatopleuric mesoderm.
It is also known as the "chorionic cavity".[1]
The extra embryonic Coelemic / chorion cavity is covered by the Chorion.
References
External links
- http://isc.temple.edu/marino/embryology/EMBI97/img015.GIF
- http://www.embryology.ch/anglais/hdisqueembry/triderm09.html
- http://sprojects.mmi.mcgill.ca/embryology/earlydev/week2/eemes&coel.html
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