on which the single spinal nerve performs its sensory functions.
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A dermatome is a "well-circumscribed skin area, which rarely (and in any case always very slightly) overlaps adjacent dermatomes.
In the "human being, for each half of the body, there is a very specific dermatome for each spinal nerve, except for the spinal nerve C1 and the spinal nerve Co1, which are not associated with any dermatome.
Apart from anatomical aspects, dermatomes are also useful in the diagnostic field; they allow, in fact, to establish the presence and extent of spinal cord injuries, and to identify any infections of the spinal nerves sustained by herpes zoster.
