– common peroneal nerve is derived from (L4, L5, S1, S2) as a part of the sciatic nerve
– posterior component, supplies short head of biceps femoris in thigh, crosses posterior to lateral head of gastrocnemius, and becomes subQ behind head of fibula
– it penetrates the posterior intermuscular septum, and becomes closely opposed to the periosteum of the proximal fibula
– it then divides into superficial & deep peroneal nerves
– nerve also gives off a lateral sural cutaneous brach which joins with the the medial sural cutaneous nerve (from tibial nerve) to form the sural nerve.
Wheeless’ Textbook ofOrthopedics. Retireved Aug. 20 2009 from http://www.wheelessonline.com/ortho/peroneal_nerve