EXTREMITIES. 51 



7 



Tarsal joint. — Division : , -Tibio-tarsal, superior 

 iiiter-tarsal, tarso-tarsal, inferior inter-tarsal, tarso-met- 

 atar^a\ ^^'^^ ^xi^'^^^ '^^'^ • 



Tibio-tarsal joint — Perfect liinge. On the tibia 

 a donble pulley, on the astragalus, the trochlea of the 

 supero-anterior faces ; two lateral external, three lat- 

 eral internal, one anterior and one posterior ligaments ; 

 the last two are capsular. One synovial membrane. 

 Motions : extension and flexion. 



Superior intertarsal joint — Arthrodia. Anterior 

 face of lower extremity of the os calcis and the poste- 

 rior facettes of the astragalus. Four ligaments : one 

 superior, one interosseous, one external and one inter- 

 nal. Sliding motion. 



Tarso tarsal joint — Arthrodia. The facettes on the 

 OS calcis and the inferior face of the astragalus above, 

 below tlie superior face pf the scaphoid and cuboid, 

 bix ligaments : two lateral,rone calcaneo-nietatarsal, 

 one astragaio-metatarsal, one posterior tarso-metatarsal 

 and one interosseous. One synovial capsula. Motion 

 very limited. 



Inferior inter-tarsal joint — Arthrodia — with al- 

 most no motion. On the cuboid two facettes for the 

 scaphoid and two for the great cuneiform ; on the sca- 

 phoid, facettes on the inferior surface for both cunei- 

 forms ; the two cuneiforms have each one small facet. 



