Paraxial mesoderm

Infobox Embryology
Name = PAGENAME
Latin =
GraySubject = 6
GrayPage = 50

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Caption = Transverse section of a chick embryo of forty-five hours’ incubation.
* "Chordamesoderm:" yellow, at notochord.
* "Paraxial mesoderm:" red, at somite.
* "Intermediate mesoderm:" purple, near Wolffian duct.
* "Lateral plate mesoderm:" purple, near "Somatic mesoderm" and "Splanchic mesoderm".


Caption2 = Chick embryo of thirty-three hours’ incubation, viewed from the dorsal aspect. (Paraxial mesoderm labeled at left.)
System =
CarnegieStage = 9
Precursor =
GivesRiseTo = somitomere, head mesoderm
MeshName =
MeshNumber =
DorlandsPre = m_11
DorlandsSuf = 12527037

Paraxial mesoderm is the area of mesoderm that forms just lateral to the neural tube on both sides.

It gives rise to the somitomeres/somites and mesoderm of the branchial arches.

*Somites form the vertebral column, dermis and skeletal muscle
*Branchial arches will develop into facial muscle and cartilage, plus other structures.

* eventually differentiates into the axial skeleton, skeletal muscle, part of the dermis
* almost immediately as it is formed, somitomeres develop.
* starts with several pairs in the cranial region, and increasingly more proceed to develop towardsthe caudal region.
* The original seven pairs form the straited muscles of head and neck, which develop within thepharyngeal arches
* The other somitomeres develop further, to form discrete blocks called somites, starting atapproximately 20 days.

External links

* [http://www.ncbi.nlm.nih.gov/books/bv.fcgi?db=Books&rid=dbio.section.3455 Overview at nih.gov]
* [http://sprojects.mmi.mcgill.ca/embryology/earlydev/week4/somites.html Diagram and overview at mcgill.ca]
* [http://connection.lww.com/Products/sadler/images/figurelarge5-9.jpgDiagram at lww.com]