THE LEG 473 



(L. 4, 5, S. i, 2) arises from the common peroneal nerve opposite 

 the neck of the fibula. It passes forwards between the bone 

 and the peronaeus longus muscle, and then descends immediately 

 behind the anterior intermuscular (peroneal) septum. In this 

 part of its course it supplies branches to the peronseus longus 

 and brevis muscles. At the junction of the middle and distal 

 thirds of the anterior intermuscular septum the nerve pierces 

 the deep fascia and then passes distally and medially across the 

 extensor tendons. It supplies the skin on the dorsum of the 

 foot, the medial side of the dorsal aspect of the hallux, and the 



j Transverse ligament 



Peronreus longus 



iceus brevis 

 Superior retinaculum 

 Tendo calcaneus 



nciate ligament 

 Extensor digitorum longus 



Extensor digitorum brevis 

 sronseus tertius 



Inferior retinaculum | | Peronreus brevis 



Trochlear process Perona:us longus 



FIG. 139. The Lateral Aspect of the Ankle and Foot. 



adjacent sides of the second, third, fourth, and fifth toes. The 

 adjacent sides of the first and second toes are supplied by the 

 medial division of the deep peroneal (anterior tibial) nerve, while 

 the lateral side of the fifth toe receives branches from the nervus 

 suralis (p. 446). 



The Lateral Compartment of the Leg is occupied by 

 the Peronseus Longus and Brevis, which both arise from the 

 lateral aspect of the fibula and pass down behind the lateral 

 malleolus. In this situation they possess a common synovial 

 sheath and are kept in place by the superior retinaculum (p. 471). 

 Below the lateral malleolus the tendons run forwards over the 

 lateral aspect of the calcaneus, and the brevis passes above and 

 the longus below the trochlear process. In this situation the 



