THE MUSCLES. 181 



rior) surface of tibia. Use : to flex the leg and roll it somewhat 

 inwards. 



3*76. 11. Tibialis posticus s. nauticus. 



Pos. : the deepest, between tibia and fibula upon Kg. inter- 

 osseum, covered by flexor commun. long., halluc. propr. and 

 soleus. Its tendon in front of that of the flex. comm. longus, 

 goes under the internal malleolus. Or.: tibia (posterior surface), 

 fibula (internal angle), lig. interosseum. Ins.: tuber oss. navi- 

 cularis (inner border) ; and with aponeurotic appendages to oss. 

 cuneiform. 2. and 3. Use : extends the foot, rotates the sole 

 inwards. 



377. 12. flexor digitorum communis long. s. perforans. 

 Pos.: the most internal, along the posterior surface of the tibia 



and sole of the foot, penniform ; between tibial. post, and tibia, 

 covered above by soleus, behind Vasa and Nn. tibiales postici. 

 Or.': linea obliq. tibiae (under m. poplit. and soleus}, and three- 

 fifths of the centre of the Tibia (posterior surface). Ins. : Basis 

 phalang. III. of the second to the fifth toe (plantar surface). 

 The tendon lies : on the internal malleolus behind that of the 

 tibial post., on the inner border of the foot rather externally; 

 passes between colds and abductor, halluc. long, into the sole 

 of the foot: in the metatarsus upon the interossci. Use : flexes 

 the four outer toes, and after that extends the foot. 



REMARK. Pulleys and tendinous sheaths like the flexors of the fingers. 



378. 13. Flexor hallucis longus. 



Pos.: the most external and strongest, covered behind by soleus 

 and tendo Jlch. behind fibula, tibial. post, and Art. peronasa, 

 (below) lig. inteross. On the outer border : peron. long, and 

 brev.; on its inner border : flex, communis Ion g. The tendon 

 curves towards the sole, passing obliquely over the flex, commun. 

 long. Or. : fibula (posterior internal surface from the two in- 

 ferior thirds). Ins.: Basis phalang. II. hallucis (plantar sur- 

 face) united (by fascia] with the last muscle. Use : to flex the 

 second phalanx of the great toe; assists (when the foot is raised) 

 to extend the foot. 



[In the sole of the foot the tendon of this muscle is connected, by a ten- 

 dinous slip, with that of the last.] 

 Nerves for 7. to 13.: tibialis. 



379. Fascia s. vagina cruris. 



Invests only those parts of the leg covered by muscles, is con- 

 nected above and behind with the fascia femoris, strengthened 

 by tendinous expansions from the biceps, sartorius, gracilis, 



