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2. Somite Development - Early Somite

  • Paraxial mesoderm towards the rostral (cranial) end, begins to segment forming the first somite.
  • Somites are then sequentially added caudally in pairs.
  • The somite surface cells undergo a mesenchymal to epithelial transition, forming a transient epithelial covering on each somite.
  • The mesoderm under the surface remains as mesenchyme and proliferates.
  • The early forming somites have a cavity (somitocoel) in their core that is lost as the somite matures.


Note - the cartoons show just the embryo righthand side mesoderm development (the same events occur on the lefthand side).

Somite Links: 1 paraxial | 2 early somite | 3 sclerotome and dermomyotome | 4 dermatome and myotome | 5 somite spreading | SEM image - Human Embryo (week 4) showing somites | Movie - somitogenesis Hes expression

Cite this page: Hill, M.A. (2024, April 18) Embryology Somite cartoon2.png. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Somite_cartoon2.png

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© Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G

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Date/TimeThumbnailDimensionsUserComment
current17:59, 16 May 2014Thumbnail for version as of 17:59, 16 May 2014400 × 300 (16 KB)Z8600021 (talk | contribs)
10:41, 10 August 2009Thumbnail for version as of 10:41, 10 August 2009216 × 181 (3 KB)MarkHill (talk | contribs)Somite Development cartoon 2 Paraxial mesoderm towards the rostral end, begins to segment forming the first somite. Somites are then sequentially added caudally. The somitocoel, is a cavity forming in early somites, which is lost as the somite matures.

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