Which dermatome is on the thumb?

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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 is on the thumb?

Explanation:
Dermatomes map skin areas to specific spinal nerve roots, and the thumb falls in the C6 distribution. The C6 dermatome includes the lateral forearm and the radial (thumb-side) aspect of the hand, which is why sensation on the thumb points to C6. In contrast, L3 covers regions around the thigh/knee, C8 targets the medial hand and little/ring fingers, and S1 covers the lateral aspect of the foot and heel. So the thumb aligns best with the C6 dermatome.

Dermatomes map skin areas to specific spinal nerve roots, and the thumb falls in the C6 distribution. The C6 dermatome includes the lateral forearm and the radial (thumb-side) aspect of the hand, which is why sensation on the thumb points to C6. In contrast, L3 covers regions around the thigh/knee, C8 targets the medial hand and little/ring fingers, and S1 covers the lateral aspect of the foot and heel. So the thumb aligns best with the C6 dermatome.

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