96 



OSTEOLOGY. 



inferior surface is slightly convex, and presents three articular 



facets, two of them, separated by 

 a rough excavation, articulating 

 with the cuneiforme medium, 

 while the third is small, and 

 articulates with the cuneiforme 

 parvum behind. The anterior 

 and internal lateral borders are 

 rough, for ligamentous attach- 

 ment; the external lateral border 

 has two facets, which articulate 

 with the cuboid, the intervening 

 portion being roughened. The 

 posterior border, the smallest, is 

 irregular, and gives attachment 

 to ligaments. The large cunei- 

 form bone articulates with the 

 astragalus, the cuboid, mediunv 

 and small cuneiform bones.' 



OS CUNEIFORME MEDIUM. 



(Fig. 22. 4.) 



The median cuneiform bone 

 is somewhat flattened and tri- 

 angular in shape, and a little 

 smaller than the magnum, under- 

 neath which it is placed. 



The superior surface is con- 

 cave, and presents two articular 

 surfaces for the magnum, with 

 a roughened transverse space 

 between. The inferior surface 

 is convex, and rests on, and 

 articulates with, the large meta- 

 tarsal bone. The anterior border 

 is rough, for ligaments ; the 

 external lateral border has two 

 facets for articulation with the 

 cuboid, with a roughened depres- 

 lateral border has one very small 



Fig. 2a. 

 External view of bones of left tarsus, meta- 

 tarsus, and digit of a Horse. 1, Distal end 

 of tibia ; 2, Calcaneum ; 3, Astragalus ; 4, 

 Cuboid ; 5, Cuneiforme magnum ; 6, Cunei- 

 forme medium ; 7, Great metatarsal : 8, Exter- 

 nal small metatarsal (splint); 9, Proximal 

 phalanx (os suffraginis) ; 10, Sesamoids; 11, 

 Median phclanx (os coronas); 12, Distal 

 phalanx (os pedis); 14, Third Sesamoid (os 

 naviculare) ; 15, Basilar process. 



sion between : the internal 



