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Paraxial mesoderm
Gray19 with color.png
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".
Gray18.png
Chick embryo of thirty-three hours’ incubation, viewed from the dorsal aspect. (Paraxial mesoderm labeled at left.)
Gray's subject #6 50
Carnegie stage 9
Gives rise to somitomere, head mesoderm

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.


  • 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 towards

the caudal region.

  • The original seven pairs form the striated muscles of head and neck, which develop within the

pharyngeal arches

  • The other somitomeres develop further, to form discrete blocks called somites, starting at

approximately 20 days.

[edit] External links

This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained within it may be outdated.




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