Medial sural cutaneous nerve originating from nerve to medial head of gastrocnemius muscle (MSCN: medial sural cutaneous nerve. LSCN: lateral sural cutaneous nerve. TN: tibial nerve. CPN: common peroneal nerve. PCN: peroneal communicating nerve. G: two heads of gastrocnemius muscle. Arrow head shows nerve to medial head of gastrocnemius muscle).