Which dermatome maps to the dorsal/palmar surface of the 3rd digit?

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Multiple Choice

Which dermatome maps to the dorsal/palmar surface of the 3rd digit?

Explanation:
Dermatomes are skin areas innervated by a single spinal nerve root. The middle finger—the 3rd digit—receives its sensory input primarily from the C7 dermatome, covering both its palmar and dorsal surfaces. That’s why sensation on the middle finger reflects C7. By contrast, the thumb and lateral index finger are mainly C6, the little finger and medial hand are C8, and C5 is higher up, around the lateral arm and shoulder regions. So the dorsal and palmar surfaces of the 3rd digit align with C7.

Dermatomes are skin areas innervated by a single spinal nerve root. The middle finger—the 3rd digit—receives its sensory input primarily from the C7 dermatome, covering both its palmar and dorsal surfaces. That’s why sensation on the middle finger reflects C7. By contrast, the thumb and lateral index finger are mainly C6, the little finger and medial hand are C8, and C5 is higher up, around the lateral arm and shoulder regions. So the dorsal and palmar surfaces of the 3rd digit align with C7.

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