what is dermatome
For other uses, see Dermatome (disambiguation) . A dermatome is an area of skin that is mainly supplied by a single spinal nerve. There are 8 cervical nerves (C1 being an exception with no dermatome), 12 thoracic nerves, 5 lumbar nerves and 5 sacral nerves.Each of these nerves relays sensation (including pain) from a particular region of skin to the brain. dermatome also refers to the part of an embryonic somite. Along the thorax and abdomen the dermatomes are like a stack of discs forming a human, each supplied by a different spinal nerve.