THE LEG. 



547 



It will thus be seen that the extensor and flexor groups are composed of pre- 

 cisely similar muscles only on opposite sides of the leg. They tend to move the foot 

 and toes forward and backward and balance each other. The abductors form a group 



Anterior tibial- 



Extensor longus 

 hallucis 



Extensor longus 

 digitorum 

 Peroneus tertius 

 Peroneus brevis 

 Peroneus longus 



Peroneus tertius 

 Peroneus brevis 

 Peroneus longus 



Plantaris 



Inner and outer 

 , heads of 

 gastrocnemius 



Popliteus 



Soleus 



Gastrocnemius 



Flexor longus 

 digitorum 

 Posterior tibial 



Flexor longus 

 hallucis 



Tendo calcaneus 

 (Achillis) 



FIG. 559. Extensor and abductor muscles of the leg. FIG. 560. Flexors and muscles of the calf of the leg. 



around the fibula on the outer side of the leg and they abduct the foot. They tend 

 to pronate it. The most active agents in adduction are the tibialis anterior and 

 tibialis posterior. The muscles of the calf form a separate posterior group designed 



