File:Mesoderm cartoon 09.jpg: Difference between revisions

Latest revision as of 19:42, 16 May 2014

Neural crest cells will migrate beside and through somite and finally the somite structure is lost and spreads as the 3 component parts.

Sclerotome - from the left and right somite at each level will engulf the notochord. This transient structure is then resegmented to form the axial skeleton, vertebra and intervertebral discs.
Dermatome - forms a thick band in the dorsal region of the embryo. This will then spread ventrally under the surface ectoderm (epidermis) to form the dermis of the skin.
Myotome - from the ventrolateral lip of the dermomyotome, spreads both dorsally and ventrally to eventually form skeletal muscle cells.
1. Dorsally - the epimere which in turn forms epaxial muscles, located behind the vertebral column.
2. Ventrally - the hypomere, which in turn forms hypaxial muscles, located on the ventral body wall and somites at the level of the limbs will also form limb muscles.

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

Cite this page: Hill, M.A. (2024, May 18) Embryology Mesoderm cartoon 09.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Mesoderm_cartoon_09.jpg

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+==5. Somite Development - Loss of the Somite==
+Neural crest cells will migrate beside and through somite and finally the somite structure is lost and spreads as the 3 component parts.
+# '''Sclerotome''' - from the left and right somite at each level will engulf the notochord. This transient structure is then resegmented to form the axial skeleton, vertebra and intervertebral discs.
+# '''Dermatome''' - forms a thick band in the dorsal region of the embryo. This will then spread ventrally under the surface ectoderm (epidermis) to form the dermis of the skin.
+# '''Myotome''' - from the ventrolateral lip of the dermomyotome, spreads both dorsally and ventrally to eventually form skeletal muscle cells.
+## Dorsally - the '''epimere''' which in turn forms '''epaxial''' muscles, located behind the vertebral column.
+##  Ventrally - the '''hypomere''', which in turn forms '''hypaxial''' muscles, located on the ventral body wall and somites at the level of the limbs will also form limb muscles.
+{{Somite cartoon}}