Paraxial mesoderm

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Paraxial mesoderm
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".
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
Dorlands/Elsevier m_11/12527037

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.

  • 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 straited muscles of head and neck, which develop within the

pharyngeal arches

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

approxiamtely 20 days.

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This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.