264 



ANTERIOR TIBIAL REGION. 



Fig. 106.* remarkable, each tendon spreads into 



a broad aponeurosis over the first 

 phalanx ; this aponeurosis divides into 

 three slips, the middle one is inserted 

 into the base of the second phalanx, 

 and the two lateral slips are continued 

 onwards, to be inserted into the base 

 of the third. 



Relations. By its anterior surface 

 with the deep fascia of the leg and 

 foot, and with the anterior annular liga- 

 ment. By its posterior surface with 

 the interosseous membrane, fibula, 

 ankle-joint, extensor brevis digitorum 

 which separates its tendons from the 

 tarsus, and with the metatarsus and 

 phalanges. By its inner surface with 

 the tibialis anticus, extensor proprius 

 pollicis, and anterior tibial vessels. By 

 its outer border with the peroneus lon- 

 gus and brevis. 



The PERONEUS TERTIUS (flexor 

 tarsi fibularis) arises from the lower 

 fourth of the fibula, and is inserted into 

 the base of the metatarsal bone of the 

 little toe. Although apparently but 

 a mere division or continuation of 

 the extensor longus digitorum, this 

 muscle may be looked upon as analo- 

 gous to the flexor carpi ulnaris of the 

 fore-arm. Sometimes it is altogether 

 wanting. 



The EXTENSOR PROPRIUS POLLICIS 

 lies between the tibialis anticus and ex- 

 tenso^ longus digitorum. It arises from 

 the lower two-thirds of the fibula and 

 interosseous membrane. Its tendon 

 passes through a distinct sheath in the 



annular ligament, and is inserted into the base of the last phalanx of 



the great toe. 



* The muscles of the anterior tibial region. 1. The extensor muscles in- 

 serted into the patella. 2. The subcutaneous surface of the tibia. 3. The 

 tibialis anticus. 4. The extensor longus digitorum. 5. The extensor proprius 

 pollicis. 6. The peroneus tertius. 7. The peroneus longus. 8. The peroneus 

 brevis. 9, Q. The borders of the soleus muscle. 10. A part of the inner belly 

 of the gastrocnemius. 11. The extensor brevis digitorum ; the tendon in front 

 of this number is that of the peroneus tertius ; and that behind it, the tendon 

 of the peroneus brevis. 



