bas< 



THE MUSCLES ON THE LATERAL SIDE OF THE LEG. 



427 



e of the first metatarsal bones (Fig. 379, p. 425). As it enters the sole of the foot 



a fibro- cartilage is formed in the 

 tendon, which plays over a 1 smooth 

 tubercle on the cuboid bone, a bursa 

 intervening. In its passage across 

 the foot the tendon is enclosed in a 

 sheath derived from the long plantar 

 (long calcaneo-cuboid) ligaments and 

 the tibialis posterior tendon. 



Nerve - Supply. Superficial peroneal 

 nerve (L. 4. 5. S. 1.). 



Actions. An extensor of tne ankle ; 

 this muscle also everts the foot. It 

 trengthens the arch of the foot* by its 

 passage across the sole to its insertion. 



SEMIMEMBKANOSUS 



TENDON (CUt) 



Tibial nerve and 

 ~ popliteal vessels 



PLANTAKIS TENDON 

 (cut) 



FIG. 381. THE INSERTIONS -OF THE TIBIALIS 

 \ POSTERIOR AND PERON/EDS LONGUS IN THE SOLE 



IF THE LEFT FOOT. 

 M. Peronseus Brevis. The 

 peronaeus brevis arises by fleshy 

 fibres from the distal two-thirds of 

 the lateral surface of the body of the 

 fibula, and from an intermuscular 

 septum along its anterior border. 



Its tendon grooves the back of 

 the lateral malleolus and the lateral 

 side of the calcaneus, invested by a 

 mucous sheath common to it and 

 the peronseus longus, and is inserted 

 into the tuberosity and dorsal surface 

 of the base of the fifth metatarsal 

 bone. 



The peronneus longus and brevis may be 

 fused together, Or additional slips may be 

 present, as peronseus accessorius, peronaeus 

 digiti quinti, peronaeocalcaneus externus, 

 and peronseocuboideus. 



TENDO CALCANEUS 



Ligamentuni 

 laciniatum 



PERON^US LONGUS 



Superior retina- 

 culum of 

 peroueal muscles 



Nerve - Supply. Superficial peroneal 

 e (L. 4. 5. S. 1.). 



>ns. An extensor of the ankle and an evertor of the foot. 



ei Actio 



FIG. 382. THE RIGHT SOLEUS MUSCLE. 



