162 



HUMAN ANATOMY. 



EXTENSOR LONGUS DIGITORUM. Origin, from the upper 

 two-thirds of the anterior aspect of the shaft of the fibula and the 

 outer tuberosity of the tibia, from the deep fascia of the inter- 

 osseous membrane and the intermuscular septum, between it and 

 the perinei on the outer and the tibialis anticus on the inner 

 side; insertion, by three tendons into the bases of the first and 



FIG. 102. 



Anterior muscles of leg: 3, tibialis 

 anticus; 4, extensor longus digitorum; 

 5, extensor proprius pollicis; 6, pe- 

 roneus tertius; 7, peroneus longus; 

 8, peroneus brevis. 



FIG. 103. 



Posterior muscles of leg: 4, pop- 

 liteus; 5, gastrocnemius: 6, tendo 

 Achillis; 8, tendons of peroneus 

 longus and brevis; 9, tibialis posticus 

 and flexors. 



second phalanges of the four lesser toes, the innermost tendon 

 dividing into two; each tendon (except the fourth) is joined 

 opposite the metatarso-phalangeal joint by the tendon of the 

 extensor brevis digitorum, and receives an expansion from the 

 lumbricales and interossei; at the first interphalangeal articula- 

 tion the tendons divide into three slips the middle one for inser- 



