Which dermatome is on the outer aspect of the forearm?

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Multiple Choice

Which dermatome is on the outer aspect of the forearm?

Explanation:
Dermatomes map skin sensation to specific spinal nerve roots. For the arm, the C5–C8 roots cover regions from the shoulder down to the hand. The outer (lateral) aspect of the forearm, toward the thumb side, is supplied by the C6 dermatome. That’s why sensation on that lateral forearm corresponds to C6. In contrast, L5 relates to the lateral leg/dorsum of the foot, S3 to the perineal region, and T1 to the medial forearm near the inner arm. So the outer forearm area is C6.

Dermatomes map skin sensation to specific spinal nerve roots. For the arm, the C5–C8 roots cover regions from the shoulder down to the hand. The outer (lateral) aspect of the forearm, toward the thumb side, is supplied by the C6 dermatome. That’s why sensation on that lateral forearm corresponds to C6. In contrast, L5 relates to the lateral leg/dorsum of the foot, S3 to the perineal region, and T1 to the medial forearm near the inner arm. So the outer forearm area is C6.

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