Intra-embryonic coelom

Intra-embryonic coelom
Details
Days	23
Precursor	lateral plate mesoderm
Gives rise to	pericardial cavity, pleural cavity, peritoneal cavity
Identifiers
Latin	coeloma intraembryonicum
Code	TE E5.8.0.0.2.0.1
*Anatomical terminology* [edit on Wikidata]

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 third week of development. During the third 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. The coelomic spaces in the lateral mesoderm and cardiogenic area are isolated. The isolated coelom begin to organize into a horseshoe shape. The spaces soon join together and form a single horseshoe-shaped cavity, the Intraembryonic Coelom which separates the mesoderm into two layers

It briefly has a connection with the extraembryonic coelom.

External links

Human embryogenesis in the first three weeks

Week 1

Week 2
(Bilaminar)

Week 3
(Trilaminar)

Germ layers	Archenteron/Primitive streak Primitive pit Primitive knot/Blastopore Primitive groove Gastrula Gastrulation Regional specification Embryonic disc

Ectoderm	Surface ectoderm Neuroectoderm Somatopleuric mesenchyme Neurulation Neural crest

Endoderm	Splanchnopleuric mesenchyme

Mesoderm	Axial mesoderm Paraxial Somite Somitomere Intermediate Lateral plate Intraembryonic coelom Splanchnopleuric mesenchyme Somatopleuric mesenchyme

Development of the digestive system

Foregut	Stomodeum Buccopharyngeal membrane Rathke's pouch Tracheoesophageal septum Pancreatic bud Hepatic diverticulum

Midgut	Midgut

Hindgut	Urorectal septum Proctodeum Cloaca Cloacal membrane

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