Paraxial mesoderm
4781927
164108807
2007-10-12T19:12:49Z
128.104.117.175
{{Infobox Embryology |
Name = {{PAGENAME}} |
Latin = |
GraySubject = 6 |
GrayPage = 50 |
Image = Image19.png |
Caption = Transverse section of a chick embryo of forty-five hours’ incubation.<BR>* ''[[Chordamesoderm]]:'' yellow, at [[notochord]].<BR>* ''Paraxial mesoderm:'' red, at [[somite]].<BR>* ''[[Intermediate mesoderm]]:'' purple, near [[Wolffian duct]].<BR>* ''[[Lateral plate mesoderm]]:'' purple, near "Somatic mesoderm" and "Splanchic mesoderm". |
Image2 = Gray18.png |
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]] |
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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 [[somitomere]]s/[[somite]]s 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
approximately 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.jpg Diagram at lww.com]
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{{Embryology}}[[Category:Embryology]]