Published on February 15, 2014
Dermatomes & some other relevant stuff.. 1
Overview The surface of the skin is divided into specific areas called dermatomes, which are derived from the cells of a somite. These cells differentiate into 3 regions / 1- Myotome ; gives rise to the skeletal musculature. 2-Dermatome ; gives rise to the connective tissue of the skin. 3-Sclerotome ; gives rise to the vertebrae 2
Dermatome A dermatome is an area of skin in which sensory nerves derive from a single spinal nerve root. In the developing embryo, the dermatome arises from 1 of the 3 segments (somites) of the mesoderm, the middle layer of embryonic tissue 3
Variations? The dermatomes along the arms and legs differ from the pattern of the trunk dermatomes, because they run longitudinally along the limbs. The general pattern is similar in all people, but significant variations exist in dermatome maps from person to person 8
Natural Variants The dermatome is a basic concept, yet much variability exists between dermatome maps in standard anatomy and medical guideline textbooks. 9
Clinical significance • Dermatomes are useful to help localize neurologic levels, particularly in radiculopathy. • Viruses that infect spinal nerves, such as herpes zoster infections (shingles), can reveal their origin by showing up as a painful dermatomic area. 11
Thank you For further info. / http://emedicine.medscape.com/article/1878388-overview#showall
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