Dermatome to the thumb?

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Multiple Choice

Dermatome to the thumb?

Explanation:
Dermatomes are skin areas innervated by sensory fibers from a specific spinal nerve root. The thumb lies on the radial, or lateral, side of the hand and is supplied mainly by the C6 dermatome. That makes sensation testing of the thumb a good cue for C6. The other options map to different skin regions: C5 is more toward the lateral upper arm near the shoulder, C7 to the middle finger, and C8 to the ring and little fingers on the ulnar side. Hence the thumb corresponds to C6.

Dermatomes are skin areas innervated by sensory fibers from a specific spinal nerve root. The thumb lies on the radial, or lateral, side of the hand and is supplied mainly by the C6 dermatome. That makes sensation testing of the thumb a good cue for C6. The other options map to different skin regions: C5 is more toward the lateral upper arm near the shoulder, C7 to the middle finger, and C8 to the ring and little fingers on the ulnar side. Hence the thumb corresponds to C6.

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