Which dermatome corresponds to the medial malleolus/foot?

• A. C4
• B. L4
• C. S1
• D. T1

Answer: (B)

Dermatomes map skin sensation to specific spinal nerve roots. The area around the medial malleolus and the medial side of the foot is supplied by the L4 dermatome, so testing sensation there helps localize the L4 nerve root. The L5 dermatome covers the dorsum of the foot and the great toe, while S1 covers the lateral foot and heel; other regions like the shoulder or forearm are served by higher or different roots such as C4 or T1. In short, the medial malleolus region aligns with the L4 dermatome, reflecting the nerve root that supplies that skin area.