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". | ||
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| 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.
- 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 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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