MUSCLES AND FASCIA OF LOWER EXTREMITY 167 



(1) Anterior fibers of the gluteus medius (2) and 

 minimus; (3) tensor vaginae femoris; and some say (4) 

 the condylar part of the adductor magnus, rotate the 

 thigh inward. 



Muscles of the Leg 



The Anterior Tibiofibular Region (Extensors). Tibi- 

 alis Anticus. Origin, outer tuberosity of the tibia, 

 upper half of the outer surface of that bone, and 

 adjacent interosseous membrane, fascia of the leg, 

 and intermuscular septum; insertion, oval mark on the 

 inner and lower part of the internal cuneiform and first 

 metatarsal dividing into two slips. 



Extensor Longus or Proprius Hallucis. Origin, 

 middle two-fourths of the narrow anterior surface of 

 the fibula and contiguous portion of the interosseous 

 membrane; insertion, base of the terminal phalanx of 

 the great toe on the dorsal aspect. It spreads in an 

 expansion on each side over the metatarsophalangeal 

 articulation, and almost always sends a slip to the 

 base of the first phalanx. 



Extensor Longus Digitorum Pedis. Origin, external 

 tuberosity of the tibia, head, and upper two-thirds of 

 the anterior surface of the fibula, very largely from 

 the septa and fascia and interosseous membrane above 

 the origin of the extensor proprius hallucis. Tendon 

 divides into four slips for the outer four toes. They 

 are continued into expansions which are joined on 

 the first phalanx by processes from the interossei 

 and lumbricales. They divide into three parts the 

 middle inserted into the middle phalanx; the lateral 

 parts unite, and are inserted into the base of the 

 terminal phalanx as in case of the extensors of the 

 fingers. 



Peroneus Tertius. Origin, lower third or more of 

 the anterior surface of the fibula, from the interosseous 

 membrane, from the septum between it and the 



