MUSCLES OF THE LOWER EXTREMITIES. 



223 



TIBIALIS ANTICUS. 



Origin Outer surface of shaft of tibia, interosseous 



membrane. 

 Insertion Dorsal and inner side of base of meta- 



tarsal of great toe. 

 Nerve Anterior tibial. 

 EXTENSOR LONGUS DIGITORUM. 

 Origin Anterior upper part 



of fibular and interosseous 



membrane. 

 Insertion Divides into four 



tendons, to be inserted upon 



the four outer toes similarly 



to the insertion of the 



common extensor of the 



fingers. 



Nerve Anterior tibial. 

 EXTENSOR PROPRIUS POLLICIS. 

 Origin Anterior surface of 



middle third of fibula and 



interosseous membrane. 

 Insertion Passes down be- 

 tween the tibialis anticus 



and extensor longus digi- 



torum ; inserted at the 



base of the last phalanx 



of the great toe. 

 Nerve Anterior tibial. 

 PERONEUS TERTIUS. 



Origin Lower fourth of anterior part of fibula and 



interosseous membrane. 

 Insertion Upper surface of the base of metatarsal of 



little toe. 

 Nerve Anterior tibial. 



FIG. 100. ANTERIOR MUSCLES 

 OF LEG. 



3, tibialis anticus: 4. extensor 

 longus digitorum : 5, extensor proprius 

 pollicis; 6. peroneus tertius : 7, peroneus 

 longus ; 8. peroneus breris. 



