Which dermatome corresponds to the dorsum of the foot?

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Study for the Parkinson’s Disease Exam. Engage with detailed flashcards and multiple-choice questions, each offering hints and explanations. Prepare effectively for your exam!

Multiple Choice

Which dermatome corresponds to the dorsum of the foot?

Explanation:
Dermatomes map skin areas to specific spinal nerve roots, so testing sensation on a particular area can localize the nerve involved. The skin on the dorsum (top) of the foot, including the region over the big toe and the first web space, is supplied by the L5 dermatome. That’s why this area points to the fifth lumbar nerve root when assessing sensation. In contrast, the medial side of the foot and shin is more L4, the lateral side and plantar surface of the foot are more S1, and C6 relates to the arm/hand region, not the foot. So the dorsum of the foot best fits with the L5 dermatome.

Dermatomes map skin areas to specific spinal nerve roots, so testing sensation on a particular area can localize the nerve involved. The skin on the dorsum (top) of the foot, including the region over the big toe and the first web space, is supplied by the L5 dermatome. That’s why this area points to the fifth lumbar nerve root when assessing sensation. In contrast, the medial side of the foot and shin is more L4, the lateral side and plantar surface of the foot are more S1, and C6 relates to the arm/hand region, not the foot. So the dorsum of the foot best fits with the L5 dermatome.

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