A patient with a leg injury has loss of eversion of the foot with intact inversion, and sensory loss over the lower lateral leg and dorsum of the foot, but ankle dorsiflexion is preserved. The lesion lies in the:

• A Deep peroneal nerve
• B Tibial nerve below the knee
• C Superficial peroneal nerve ✓
• D Sural nerve

Explanation

The superficial peroneal nerve supplies peroneus longus and brevis, the evertors, and carries sensation from the lower lateral leg and dorsum of the foot. Isolated loss of eversion with preserved dorsiflexion localises to this nerve, since dorsiflexion depends on the deep peroneal branch. Tibial nerve injury abolishes inversion and plantarflexion with sole sensory loss, and the sural nerve is purely sensory over the lateral foot and heel.

Reference: Gray's Anatomy for Students, 4th ed.

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Written and medically reviewed by the StethoPrep medical team.