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Dermatomes - Cervical

Dermatomes - Lumbosacral

Mr. Skin Divisions with Lumber-sack

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The skin's surface is divided into specific areas called dermatomes, which are 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 (and pain) from a particular region of skin to the brain.

6 KEY FACTS

Lumbar spinal nerve L2 correlates with dermatome distribution over the medial thigh.

The dermatome L3 correlates with distribution over the thigh with clinical significance over the medial knee.

Lumbar spinal nerve 4, L4, is characteristically distributed over the kneecap, medial ankle, and big toe.

The dorsum of the foot correlates to the distribution of L5 sensory innervation.

Sacral spinal nerve 1, S1, innervates sensory pathways in the lateral foot and posteriolateral thigh.

Sacral spinal nerves 2-5 correlate with the perianal area and the genitals.

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