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dermatome

The area of skin supplied by sensory fibers of a single dorsal nerve root. In the head & trunk each segment is horizontally disposed, except for C1 which has no sensory component. The dermatomes of the limbs from C5 to T1 & from L3 to S2, extend as a series of bands from the midline of the trunk posteriorly into the limbs. There is considerable overlap of adjacent dermatomes. As a result, no anesthesia occurs unless 2 or more adjacent dorsal roots have lost function. Additionally there is considerable variability among individuals.

Related

myotome

References

  1. Clinical Anatomy Made Ridiculously Simple. Stephen Goldberg, MedMaster Inc, Miami, 1995
  2. Grant's Atlas of Anatomy, 10th edition, AMR Agur & MJ Lee (eds), Lippincott Williams & Wilkins, Philadelphia, 1999

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