CHAP II. 



BONES OF THE HORSE'S LIMBS. 



399 



firmly ankylosed to the radius, and projects from the upper end thereof 

 in the prominent olecranon process. 



The carpus, or wrist popularly termed the " knee " of the horse 

 consists of seven bones in two rows (fig. 91). The upper row com- 

 prises the following four bones, named from within outward: 



Pisiform, Cuneiform, Lunar, Scaphoid. 



The lower row includes three bones, the first-named being inner- 

 most : 



Unciform, Magnum, Trapezoid. 



As the pisiform is really above and behind the carpus it is often 



Fi 



. 91. Front View of the 

 Right Carpus, or " Knee," 

 of the Horse. 



Showing the lower end of the 

 radius above, the upper end of 

 the cannon bone below, and the 

 carpal bones between. 



Fig. 92. Side View of the Bones 

 below the Carpus of the Horse. 



Showing the lower end of the cannon 

 bone, with the two floating bones (sesa- 

 moids) behind, then the pastern, the 

 coronet, and the coffin bcfne, with the 

 "navicular" behind the junction of the 

 two last-named. 



called, by veterinarians, the supercarpal bone. Of the remaining bones 

 in the upper row, the scaphoid is larger than the lunar, and the lunar 

 than the cuneiform. In the interior row the unciform is thickest, the 

 trapezoid thinnest, the magnum largest, the trapezoid smallest. 



Of the fiv-e normal digits the horse has only the middle one the 

 third fully developed. The first and fifth are entirely absent, and the 

 second and fourth are reduced to mere splint bones flanking the third. 

 The metacarpal bone, called the cannon bone or shank bone, corresponds 



