26 



HORSESHOEING. 



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



of the condyles of the cannon 

 Fig. 4. bone, increase the articular sur- 



faces 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 tlie first phalanx. The lower 



Os suffraginis with both sesamoid bones . - /-n- ^^ ^\ 



in position, as in Fig. 3. A, os suf=fraginis; B, artlCUiar SUrfaCO (-E Ig. 0,d) TO- 

 sesamoid bones; a, upper joint-surface of 1,1 j.U 1 J J? j-X, 



long pastern; b, joint-surface of sesamoid SemblcS the ioWCr CUd 0± the 

 bones; c, roughened surface at upper end; £j.g^ phalaUX. The Upper pOStC- 

 d, roughened surface at lower end, both for i l if r 



attachment of ligaments; e, lower joint sur- j-Jor bordor of tllis boUC is promi- 

 nent and prolonged transversely 

 a supporting ledge for the first phalanx, 

 as a point of attachment 

 Fig. 6. 



face. 



(Fig. 6, a), to serve 



Fig. 5. 



Short pastern (os coronse) 

 viewed in front and in pro- 

 file: a, upper joint-surface; 

 b, anterior surface; c, lat- 

 eral surface; d, lower joint- 

 surface. 



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 hoof. The anterior 

 or wall-surface (a) is 



Short pastern seen 

 from behind: a, smooth 

 surface over which i ti 



the perforans tendon rOUgh, llKC pumice StOUB. 



surfrc'e. ' ""^^"^ ^°''^*' Above and in front is the 



pyramidal eminence to 

 which the tendon of the anterior extensor of the phalanges 

 attaches. Behind, the bone extends backward to form the 



