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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