![]() The word dermatome is formed from Ancient Greek δέρμα 'skin, hide' and τέμνω 'cut'. Although the general pattern is similar in all people, the precise areas of innervation are as unique to an individual as fingerprints.Īn area of skin innervated by a single nerve is called a peripheral nerve field. Along the arms and the legs, the pattern is different: the dermatomes run longitudinally along the limbs. The term is also used to refer to a part of an embryonic somite.Īlong the thorax and abdomen the dermatomes are like a stack of discs forming a human, each supplied by a different spinal nerve. There are 8 cervical nerves (C1 being an exception with no dermatome),Įach of these nerves relays sensation (including pain) from a particular region of skin to the brain. A dermatome is an area of skin that is mainly supplied by afferent nerve fibres from the dorsal root of any given spinal nerve.
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