Somitomere
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2007-10-15T01:35:23Z
Arcadian
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{{Infobox Embryology |
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CarnegieStage = 11 |
Days = third [[gestation]]al week |
Precursor = [[paraxial mesoderm]] |
GivesRiseTo = [[somites]] |
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In the developing [[vertebrate]] [[embryo]], the '''somitomeres''' are loose masses of [[paraxial mesoderm]] derived [[cell (biology)|cells]] that form along each side of the [[neural tube]] towards the end of the third [[gestation]]al week. The approximately 50 pairs of somitomeres begin developing in the cranial (head) region, continuing in a caudal (tail) direction until the end of week four.
==Development==
The first seven somitomeres give rise to the striated muscles of the [[face]], [[jaw]]s, and [[throat]].
The remaining somitomeres, likely driven by periodic expression of the ''[[hairy (gene)|hairy]]'' gene, begin expressing adhesion proteins such as [[cadherin|N-cadherin]] and [[fibronectin]], compact, and bud off forming [[somite]]s. The somites give rise to the [[vertebral column]] ([[sclerotome]]), associated muscles ([[myotome]]), and overlying dermis ([[dermatome]]).
==External links==
* {{EmbryologySwiss|hdisqueembry/triderm07}} - look for Fig. 16
[[Category:Embryology]]
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{{Embryology}}