Muscles of the Lower Extremity. 



199 



. The Muscles at the Anterior 

 Side: 



M. tiUalis anticus arises from the 

 external tuberosity and outer surface 

 of the tibia, the interosseous membrane 

 and- Fascia cruris; it is inserted into the 

 internal cuneiform bone and base of 

 the metatarsal bone of the great toe 

 (Fig. 272). (Flexes the tarsus and raises 

 the inner border of the foot.) 



M. extensor proprius pollicis seu extensor 

 pollicis (hallucis) longus arises from the 

 middle two-fourth of the anterior sur- 

 face of the fibula and the interosseous 

 membrane ; it is inserted into the II. pha- 

 lanx of the great toe (Fig. 272)^ 



M. extensor digitorum communis longus 

 arises from the head and anterior sur- 

 face of the fibula, the outer tuberosity of 

 the tibia and the interosseous mem- 

 brane; it is inserted by four tendons 

 into the aponeurosis on the back of the 

 II. and III. phalanges of the four outer 

 toes, and by a fifth tendon into the 

 base of the fifth metatarsal bone ; this 

 fifth tendon is often spoken of as the 

 M. peroneus tertius (Fig. 272). 



The Muscles on the Outer 

 Side: 



M. peroneus longus (Fig. 269) arises 

 by two heads from the head and upper 

 two-thirds of the outer surface of the 

 shaft of the fibula, and, running ob- 

 liquely across the Planta pedis, it is 

 inserted into the internal cuneiform 

 bone, and base of the I. and II. meta- 

 tarsal bones (Fig. 276 and 277). 

 (Extends the foot and everts the sole 

 of the foot.) 



M. peroneus brevis" arises from the 

 lower two -thirds of the external sur- 

 face of the shaft of the fibula, and 

 is inserted into the projection at the 

 base of the fifth metatarsal bone 

 (Fig. 272). (Extends and abducts the 267. The Muscles at the 



Anterior and Outer 

 Sides of the Leg. 



