Paraxial mesoderm
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| Paraxial mesoderm | |
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| 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.) | |
| Latin | mesoderma paraxiale |
| Gray's | subject #6 50 |
| Carnegie stage | 9 |
| Gives rise to | somitomere, head mesoderm |
| Code | TE E5.0.2.1.0.0.3 |
Paraxial mesoderm is the area of mesoderm that forms just lateral to the neural tube on both sides.
It differentiates rostrally into somatomeres and caudally into somites.[1]
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 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] References
- ^ Antonio Nanci (2008). Ten Cate's oral histology: development, structure, and function. Elsevier Health Sciences. pp. 25–. ISBN 9780323045575. http://books.google.com/books?id=nLW3Ts_TDpEC&pg=PA25. Retrieved 16 April 2010.
[edit] External links
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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 As such, some of the information contained within it may be outdated.
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