File:Somite cartoon1.png

From Embryology

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1. Somite Development - Paraxial Mesoderm

Mesoderm lying right and left beside the notochord (axial mesoderm) forms the paraxial mesoderm as a pair of strips along the rostro-caudal axis of the embryo. This paraxial mesoderm will then commence to segment in pairs in a rostro-caudal sequence, the paraxial mesoderm in the head region will remain unsegmented.

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, February 27) Embryology Somite cartoon1.png. Retrieved from

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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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current19:00, 16 May 2014Thumbnail for version as of 19:00, 16 May 2014400 × 300 (9 KB)Z8600021 (talk | contribs)
11:40, 10 August 2009Thumbnail for version as of 11:40, 10 August 200980 × 135 (992 bytes)MarkHill (talk | contribs)Somite Development cartoon Mesoderm beside the notochord (axial mesoderm) thickens, forming the paraxial mesoderm as a pair of strips along the rostro-caudal axis. Image source: UNSW Embryology