A.–C. Dermatome map (Foerster, 1933

A.–C. Dermatome map (Foerster, 1933). The Keegan and Garrett (1948) dermatome map is not included here. The two schemes are similar in the trunk but differ in the limbs, where both are presented. B. Schematic illustration of a dermatome and myotome. The unilateral area of skin innervated by the general sensory fibers of a single spinal nerve is called a dermatome. From clinical studies of lesions in the posterior roots or spinal nerves, dermatome maps have been devised that indicate the typical patterns of innervation of the skin by specific spinal nerves.