MUSCLES OF THE POSTERIOR LIMBS 363 



1. Anterior Extensor of the Phalanges (Extensor Pedis) (Fig. 201, 20). 



Synonyms.— FemoTO-piepheilaugeus—Girard. The exten8or longus digitorum pedis of Man. 



Situation — Direction— Extent. — This muscle, situated in front of the leg and 

 foot, follows the direction of these two sections for their whole extent. 



Form — Strmture. — It is formed of a muscular body and a tendon. The first 



Fig. 201. 



EXTERNAL DEEP MUSCLES OF RIGHT POSTERIOR LIMB. 



1, Crest of the ilium; 2, inferior sacro-sciatic ligament; 3, sacro-sciatic ligament; 4, obturator 

 ligament; 5, tuberosity of the ischium; 6. anterior tuberosity of the ilium; 7, deep gluteus, 

 8, its insertion into the great trochanter, 9 ; 10, iliacus; 11, vastus externus; 12, rectus femoris ; 

 13, great sciatic nerve; 14, gracilis; 15, sartorius; 16, patella; 17, lateral ligament; 18, oblique 

 flexor of the phalanges, or flexor pedis accessorius ; 19, peroneus ; 20, extensor pedis; 21, 

 soleus, or plantaris ; 22, gastrocnemius; 23, flexor pedis; 24, tendon of oblique flexor of the 

 phalanges; 26, perforatus tendon; 26, lateral ligament of perforatus tendon; 27, 28, annular liga- 

 ment ; 29, tendon of lateral extensor of the phalanges, or peroneus ; 30, external rudimentary 

 metatarsal bone 



is fusiform, flat on each side, aponeurotic at its superficies in its superior moiety, 

 and tendinous internally in its inferior moiety. The tendon, at first round, then 

 flat, commences a little above the inferior fourth of the tibia, and reaches the 

 anterior face of the principal metatarsus, where it receives the extensor brevis, 



