294 



ANATOMY AND PHYSIOLOGY 



Branches: 



In the leg. To the Tibialis anticus. 

 Extensor hallucis. 

 Extensor digitorum (longus). 

 Peroneus tertius. 



In the foot. Extensor digitorum (brevis). 



The tendons of these muscles pass in front of the ankle-joint. They flex 

 the foot. 



The superficial peroneal (musculo-cutaneous) runs downward 

 in the substance of the peroneal muscles to the foot. 



Branches: 



Muscular. To the Peroneus longus, peroneus brevis. 



Cutaneous. To dorsum of foot. 



Their tendons pass behind the lateral malleolus. They extend the foot. 



Tibialis posterior 

 Cruciate ligament 



Tibialis 

 posterior 



Tibialis 



anterior 



Tendo Arcfaillis 



Flexor digitorum 



longus 

 Posterior tibial 



artery 

 Tibia nerve 



Flexor digitorum longus 



FIG. 189. RELATIONS OF PARTS BEHIND THE MEDIAL MALLEOLUS. (Heath.) 



Points of interest. The superior gluteal nerve, with the superior gluteal 

 artery; the sciatic nerve, with the sciatic artery; and the pudic nerve, with the 

 pudic artery, all pass out from the pelvis through the great sciatic foramen; the 

 pudic nerve and artery return through the small sciatic foramen. 



The obturator nerve and the obturator artery pass through the obturator 

 foramen. 



The femoral nerve passes under the inguinal ligament on the lateral side 

 of the femoral artery. 



THE COCCYGEAL PLEXUS 



The remaining sacral nerves and the coccygeal nerve communi- 

 cate in a small plexus, which is important in that it sends branches 

 to the viscera of the pelvis. 



