Which dermatome is on the ankle at the medial malleolus?

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Multiple Choice

Which dermatome is on the ankle at the medial malleolus?

Explanation:
Dermatomes are skin regions innervated by a single spinal nerve root, so testing sensation in a specific area helps localize the nerve level involved. The medial malleolus on the inner ankle is a classic landmark for the L4 dermatome. That means sensation in that small area is provided by the L4 nerve root, making L4 the best match for the ankle near the medial malleolus. Other roots map to different parts of the body, not the medial ankle. For example, the dorsum of the foot and toes is typically L5, and areas around the trunk or upper limb correspond to higher or different roots like T1 or S3, so they wouldn’t align with the medial ankle region.

Dermatomes are skin regions innervated by a single spinal nerve root, so testing sensation in a specific area helps localize the nerve level involved. The medial malleolus on the inner ankle is a classic landmark for the L4 dermatome. That means sensation in that small area is provided by the L4 nerve root, making L4 the best match for the ankle near the medial malleolus.

Other roots map to different parts of the body, not the medial ankle. For example, the dorsum of the foot and toes is typically L5, and areas around the trunk or upper limb correspond to higher or different roots like T1 or S3, so they wouldn’t align with the medial ankle region.

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