Intraembryonic coelom
Encyclopedia
In the development of the human embryo the intraembryonic coelom (or somatic coelom) is a portion of the conceptus
forming in the mesoderm
. During the second week of development, the lateral mesoderm splits into a dorsal somatic mesoderm (somatopleure
) and a ventral splanchnic mesoderm (splanchnopleure
). The resulting cavity between the somatopleure
and splanchnopleure
is called the intraembryonic coelom. This space will give rise to the thoracic and abdominal cavities.
It briefly has a connection with the extraembryonic coelom
.
Conceptus
Conceptus denotes the embryo and its adnexa or associated membranes . The conceptus includes all structures that develop from the zygote, both embryonic and extraembryonic...
forming in the mesoderm
Mesoderm
In all bilaterian animals, the mesoderm is one of the three primary germ cell layers in the very early embryo. The other two layers are the ectoderm and endoderm , with the mesoderm as the middle layer between them.The mesoderm forms mesenchyme , mesothelium, non-epithelial blood corpuscles and...
. During the second week of development, the lateral mesoderm splits into a dorsal somatic mesoderm (somatopleure
Somatopleure
In the anatomy of an embryo, the somatopleuric mesenchyme is a structure created during embryogenesis when the lateral mesoderm splits into two layers. The outer layer becomes applied to the inner surface of the ectoderm, and with it forms the somatopleure.-External links:* at Yuba Community...
) and a ventral splanchnic mesoderm (splanchnopleure
Splanchnopleure
In the anatomy of an embryo, the splanchnopleuric mesenchyme is a structure created during embryogenesis when the lateral mesoderm splits into two layers. The inner layer adheres to the endoderm, and with it forms the splanchnopleure....
). The resulting cavity between the somatopleure
Somatopleure
In the anatomy of an embryo, the somatopleuric mesenchyme is a structure created during embryogenesis when the lateral mesoderm splits into two layers. The outer layer becomes applied to the inner surface of the ectoderm, and with it forms the somatopleure.-External links:* at Yuba Community...
and splanchnopleure
Splanchnopleure
In the anatomy of an embryo, the splanchnopleuric mesenchyme is a structure created during embryogenesis when the lateral mesoderm splits into two layers. The inner layer adheres to the endoderm, and with it forms the splanchnopleure....
is called the intraembryonic coelom. This space will give rise to the thoracic and abdominal cavities.
It briefly has a connection with the extraembryonic coelom
Extraembryonic coelom
The extraembryonic coelom is a portion of the conceptus consisting of a cavity between Heuser's membrane and the Trophoblast....
.
External links
- http://www.embryology.ch/anglais/hdisqueembry/triderm09.html
- http://embryology.med.unsw.edu.au/Notes/coelom.htm
- http://www.ana.ed.ac.uk/database/humat/notes/embryo/cavities/coelom.htm