MUSCLES 55 



ANTERIOR TIBIO-FIBULAR REGION. 



Tibialis anticus : external tuberosity and upper of external 

 surface of shaft of tibia, contiguous interosseous membrane, 

 fascia and intermuscular septum (F) inner surface of internal 

 cuneiform ; base of metatarsal bone of great toe(r) (Anterior 

 tibial). [Flexes ankle and extends tarsal joints, adducts and 

 inverts foot.] Passes through innermost compartment of anterior 

 annular ligament. Outer border conceals anterior tibial vessels. 



Extensor proprius hallucis : middle f of anterior surface of 

 shaft of fibula, contiguous interosseous membrane(F) base of 

 last phalanx of great toe(x) (Anterior tibial). [Flexes ankle, 

 extends tarsal joints and great toe.] Anterior tibial vessels lie 

 on the inner side, but the tendon crosses to inner side of vessels under 

 anterior annular ligament. 



Extensor longus digitorum : external tuberosity of tibia, 

 head and upper of anterior surface of shaft of fibula, inter- 

 osseous membrane(F) by four tendons into the middle and 

 last phalanges of four outer toes(x) (Anterior tibial). [Flexes 

 ankle, extends joints of tarsus and toes.] 



Peroneus tertius : lower of anterior surface of shaft of 

 fibula, interosseous membrane, intermuscular septum(F) 

 base of 5th metatarsal on dorsal surface(x) (Anterior tibial). 

 [Flexes ankle and extends tarsal joints, everting the foot.] 



POSTERIOR TIBIO-FIBULAR REGION, SUPERFICIAL LAYER. 



Gastrocnemius : Inner head. Impression on upper and 

 posterior part of. inner condyle(T), line above condyle(F). 

 Outer head. Impression on external surface of outer con- 

 dyle(x), upper and posterior part of condyle(F) unites with 

 tendon of soleus to form tendo Achillis, inserted into lower 

 half of posterior surface of os calcis(T) (Internal popliteal). 

 [Flexes knee and extends ankle.] 



Soleus : posterior surface of head, and upper J of posterior 

 surface of shaft of fibula, oblique line and middle of internal 

 border of tibia, fibrous arch over vessels(A) tendo Achillis 

 (Internal popliteal and posterior tibial). [Extends ankle.] 

 Posterior tibial vessels and nerve lie beneath. 



Plantaris : line above outer condyle, posterior ligament of 

 knee-joint(F) tuber calcis, with or by inner side of tendo 

 Achillis(x) (Internal popliteal). [Flexes knee and extends 

 ankle.] Tendon, longest in body. 



