30 



HORSESHOEING. 



and OS pedis. They are short, and unite the navicular bone with 



the OS pedis and lateral cartilages. 



Of the three phalangeal articulations, the pedal is the only one 



that permits of any'lateral movement; hence it is an imperfect 



hinge-joint. 



0. The Locomotory Organs of the Foot. 

 Though the muscles are the organs which produce motion, the 



horseshoer need con- 

 cern himself only with 

 the tendons of those 

 muscles which extend 

 and flex the phalanges. 

 These tendons are either 

 extensors or flexors. 

 The extensors lie on the 

 anterior face and the 

 flexors on the posterior 

 face of the phalanges. , 



The anterior extensor 

 of the phalanges (Fig. 

 14, a) extends the long 

 and short pasterns and 

 the hoof-bone ; it is 

 broad, and made some- 

 what broader by re- 

 ceiving the branches of 

 the suspensory ligament 

 (6') that come from the 

 sesamoid bones. It takes 

 a firm attachment on the 

 pyramidal eminence of 

 the OS pedis. In the 

 forefeet the long pastern 

 has a special extensor 



tendon (e), which is known as the lateral extensor. When the 



Right forefoot viewed from in front and from the ex- 

 ternal Bide : u, anterior extensor tendon of the toe ; b, 

 suspensory ligament of the fetlock ; V, branch of the same 

 passing forward and uniting with the extensor tendon 

 ot the toe ; c, extensor tendon of the os suffraglnis (ab- 

 sent in the hind leg), called the lateral extensor. 



