<prompt> Dermatome of UMBILICUS is:T10L2L3L4  <response>: Ans. A. T10 A dermatome is an area of skin that is mainly supplied by afferent nerve fibers from a single nerve which forms a part of a 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. Along the thorax and abdomen the dermatomes are like a stack of discs forming a human, each supplied by a different spinal nerve. 