ARTICULATIONS 



325 



the anterior border of the lateral malleolus to the immediately 

 adjacent part of the body of the talus. 



The posterior talo-fibular ligament is the strongest and the 

 most posterior of the three bands. It runs almost horizon- 

 tally, from the deep pit posterior to the distal articular surface 



FIG. 123. Ankle- and Tarsal-joints from the Medial Aspect. 



1. First tarso-metatarsal joint (opened). 



2. Tendon of tibialis anterior muscle (cut). 



3. Medial naviculo - cuneiform joint 



(opened). 



4. Dorsal naviculo-cuneiform ligament. 



5. Head of talus. 



6. Dorsal talo-navicular ligament. 



7. Trochlear surface of talus. 



8. Medial malleolus. 



9. Deltoid ligament of the ankle. 



10. Trochlear surface of talus. 



11. Groove for tendon of tibialis posterior 



muscle on inferior calcaneo-navicular 

 ligament. 



12. Groove and tunnel for the tendon of 



flexor hallucis longus muscle. 



13. Calcaneus. 



14. Sustentaculum tali. 



15. Tendon of tibialis posterior muscle (cut). 



16. Long plantar ligament. 



of the fibula to a prominent tubercle on the posterior surface 

 of the talus. 



This tubercle, the posterior process of the talus, is sometimes detached 

 and forms a supernumerary tarsal bone which may represent the os 

 trigonum found in some mammals. In such cases it may be mistaken for 

 a fracture. 



The calcaneo-fibular ligament is a round, cord -like band 



