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Sural Communicating Nerve

nervus cutaneus suralis medialis communicans

The medial sural cutaneous nerve (from the tibial nerve in the popliteal fossa) is joined by the lateral sural cutaneous nerve (from the common fibular nerve) via the sural communicating branch to form the sural nerve in the lower leg. The sural communicating nerve pierces the deep fascia in the upper calf and joins the medial sural cutaneous nerve, completing the sural nerve formation. In 20% of individuals the sural nerve forms without the communicating branch, arising entirely from the medial sural cutaneous nerve.

Region: Lower Leg

Clinical Relevance

Clinical Notes

Understanding sural nerve formation is critical for sural nerve harvesting: the communicating branch joins the medial sural nerve at variable levels (upper, mid, or lower calf), determining where the single sural nerve trunk forms. Sural nerve graft harvest requires the surgeon to identify the proximal component in the mid-calf where the two contributing nerves merge. The reverse sural flap pivot point must be distal to the peroneal perforators — the sural nerve and its accompanying short saphenous vein form the flap's neurovascular axis.

Pathology

Common Injuries & Conditions

Sural Nerve Communicating Branch Variable Anatomy for Graft Harvest

Sural nerve graft harvest requires identifying the sural nerve distal to the communicating branch junction where the single nerve trunk exists; the variable level of sural nerve formation necessitates proximal exploration to the upper calf where the medial and lateral sural components are identified before the final harvest incision is planned to capture the complete nerve.