278 SURGICAL ANATOMY OF 



anteriorly, the tendons of the extensor longus digitorum 

 and peroneus tertius, the extensor proprius pollicis, an- 

 terior tibial vessels and nerve, the tendon of the tibialis 

 anticus; posteriorly, tendons of the peroneus longus and 

 brevis, the flexor longus pollicis, the posterior tibial ves- 

 sels and nerve, the tendons of the flexor longus digito- 

 rura and tibialis posticus. 



The joint is formed by the articulation of the inferior 

 articular extremities of the tibia and fibula with the as- 

 tragalus. 



The Tibio-tarsal Articulation. The extremities of the 

 tibia and fibula are hollowed out into a sort of mortice, 



FIG. 48. 



Section of the right ankle. 1. Extensor longus digitorum and peroneus ter- 

 tius. 2. Peroneus longus. 3. Extensor proprius pollicis. 4. Peroneus brevis. 

 5. Anterior tibial vessels and nerve. 6. Flexor longus pollicis. 7. Tibialis anti- 

 cus. 8. Tendo-Achillis. 9. Tibialis posticus. 10. Plantaris. 11. Flexor longus 

 digitorum. 12. Posterior tibial vessels and nerve. (HEATH.) 



concave from before backwards, open in front and be- 

 hind, and shut in laterally by the malleoli. The use of 

 the malleoli is to prevent lateral movements, and to re- 

 strict the motions of the joint to flexion and extension. 

 The articular surface of the astragalus presents superi- 



