ARTHROLOGY. 49 



(b) Deep portion, from tibia to astragalus and calx. 

 Action. 



Flexion and extension. 

 Calcaneo-astragaloid. 



A compound diarthrodia between three or four facets on astrag- 

 alus, with same on calx. 



Ligaments. 



Superior, external lateral, internal lateral 'and interosseous, 

 running from one bone to another, as their names imply. 



Action. Very limited. 



Second row of tarsus with each other. Between scaphoid, cuboid 

 and two cuneiforms. 



Ligaments. 



Two anterior, the cuboido-cunean and cuboido-scaphoid and 

 two corresponding interosseous. 



An interosseous scaphoid-cunean and inter-cunean. 



Action. Very limited. 



Two rows of tarsus with each other. 

 Ligaments. 



Two lateral ligaments of tibio-tarsal joint. 



Calcaneo-metatarsal, from posterior border of calx to cuboid 

 and head of external metatarsal. 



Astragalo-metatarsal, from inner side of astragalus to scaphoid, 

 great cuneiform and middle metatarsal. 



Posterior tarso-metatarsal from all of tarsus to top of metatarsus. 



One interosseous, between four bones. 



Action. Very limited. 

 Tarso-metatarsal. 



Between cuboid and cuneiform above, and metatarsal below. 

 Ligaments. 



Those previously described and one strong interosseous. 



Synovial sacs of tarsus. 



i . Membrane of tibio-tarsal articulation, communicates in 

 front with that between the two rows, and behind with the superior 

 articulation of astragalus with calx. 



