24 



HORSESHOEING. 



Fig. 4. 



Os suffraginis mth both sesamoid bones 

 in position, as in Kg. 3. A, os suffraginis ; B, 



pyramidal in shape, and, lying against the posterior part of the 



condyles of the cannon bone, 

 increase the articular surfaces 

 at the upper end of the long 

 pastern. 



The short pastern (second 

 phalanx) (Figs. 5 and 6) lies 

 under the first phalanx and 

 above the os pedis ; it is some- 

 what cubical in shape. Its 

 upper articular surface (Fig. 5, 

 a) presents two glenoid cavities 

 to correspond with the condyles 

 of the first phalanx. The lower 



sesamoid bones; a, upper joint-surface of articular SUrface (Fig. 5, d) re- 

 long pastern; 6, joint-surface of sesamoid ui j-u i A f t-T„ 



bones ; c, roughened surface at upper end ; d, SembleS the lOWCr end 01 the 



roughened surface at lower end, both for flpgt phalanx. The Upper poste- 

 attachment of ligaments ; e, lower joint sur- . n n • ■, 



face. rior border oi this bone is promi- 



nent and prolonged transversely 

 (Fig. 6, a), to serve as a supporting ledge for the first phalanx, as 



a point of attachment for 

 the perforatus tendon, 

 and as a gliding surface for 

 the perforans tendon. 



The lowest bone of the 



limb is the third phalanx 



or OS pedis (Fig. 7). In 



form it is similar to the 



Short pastern seen hoof. The anterior or 



from behmd : a, smooth 



surface over which Ivall-SUrface (a) is TOUgh, 



%^frZ.T^^ like pumice stone. Above 

 surface. and in front is i\ie pyram- 



idal eminence to which the 

 tendon of the anterior extensor of the phalanges attaches. Be- 

 hind, the bone extends backward to form the inner and outer 



Short pastern (os coronse) 

 viewed in front and in pro- 

 file : a, upper jomt-surface ; 

 &, anterior surface ; c, lat- 

 eral surface ; d, lower joint- 

 surface. 



