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The dermatome is the dorsal portion of the paraxial mesoderm somite which gives rise to the skin . In the human embryo, it arises in the third week of embryogenesis . [ 2 ] It is formed when a dermomyotome (the remaining part of the somite left when the sclerotome migrates), splits to form the dermatome and the myotome. [ 2 ]
English: A diagram showing human dermatomes, i.e., skin regions with respect to the routing of their afferent nerves through the spinal cord. Svenska: Människans dermatom, sensoriska zonindelning. Date
English: A diagram showing human dermatomes, i.e., skin regions with respect to the routing of their afferent nerves through the spinal cord. Svenska: Människans dermatom, sensoriska zonindelning. Date
the sclerotome, which forms cartilage, the syndetome, which forms tendons, the Myotome, which forms skeletal muscle, the dermatome, which forms the dermis as well as skeletal muscle, and endothelial cells.
Date/Time Thumbnail Dimensions User Comment; current: 09:09, 17 October 2010: 418 × 850 (217 KB): Mikael Häggström: minor label adjustment: 08:09, 17 October 2010
In somitogenesis, somites form from the paraxial mesoderm, a particular region of mesoderm in the neurulating embryo.This tissue undergoes convergent extension as the primitive streak regresses, or as the embryo gastrulates.
For more detailed images on the upper arm, see File:Gray812and814.svg for areas of innervation, and File:Gray811and813.PNG for courses of the nerves. Date 6 March 2011
The notochord and the neural tube activate the protein SHH, which helps the somite to form its sclerotome. The cells of the sclerotome express the protein PAX1 that induces the cartilage and bone formation. The neural tube activates the protein WNT1 that expresses PAX 2 so the somite creates the myotome and dermatome.