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The sural nerve is a sensory nerve in the calf region (sura) of the leg. It is made up of collateral branches of the tibial nerve and common fibular nerve. Two cutaneous branches, the medial and lateral, form the sural nerve. The medial cutaneous branch arises from the tibial nerve, and the lateral branch arises from the common fibular nerve. The tibial nerve and the common fibular nerve arise as the sciatic nerve divides into two branches in the popliteal fossa. As the tibial nerve travels down the popliteal fossa, and before it goes beneath the gastrocnemius, it gives off a cutaneous branch which is the medial sural cutaneous nerve. This nerve courses laterally over the lateral head of the gastrocnemius. The common fibular nerve also gives off a small cutaneous branch which is the lateral sural cutaneous nerve. When the common fibular nerve is divided from the sciatic nerve, it travels parallel to the distal portion of the biceps femoris muscle and towards the fibular head. The small cutaneous branch arises as the common fibular nerve travels towards the fibular head. The nerve then continues down the leg on the posterior-lateral side, then posterior to the lateral malleolus where it runs deep to the fibularis tendon sheath and reaches the lateral tuberosity of the fifth toe, where it ramifies.

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