The C8 nerve receives sensory afferents from the C8 dermatome. An area innervated by a single dorsal root is called a dermatome. Paraesthesias or weakness involving a dermatome indicate probable spinal cord or spinal nerve root involvement. Similarly a dermatome is an area of skin that a single nerve innervates. Cutaneous lesions may be distributed anywhere in the dermatome, from midline back to abdomen. Dermatomes are similar; however, a dermatome only specifies the area served by a spinal nerve. It can also cause pain and numbness in the corresponding dermatome. The myotome and dermatome have a nerve component. Shingles may have additional symptoms, depending on the dermatome involved. However, the symptoms may not appear across the entire dermatome. A dermatome also refers to the part of an embryonic somite. In anatomy the myotome is the motor equivalent of a dermatome.