the extensor pedis tendon. 41 



1. The Extensor Pedis Tendon. 

 (Fig. 25, a.) 



The suffraginis, coronet, and pedal bones have one common 

 extensor tendon. In the fore-limb the suffraginis bone also 

 receives a special tendon, the extensor suffraginis, which lies 

 alongside the extensor pedis tendon on the outer face of the 

 limb, and is inserted into the upper part of the suffraginis. 



The extensor pedis tendon runs downwards over the front of 

 the great metacarpal bone and of the fetlock joint towards the 

 lower end of the os suffraginis, w^here it receives on either side 

 an important reinforcement from the superior sesamoidean liga- 

 ment (fig. 25, h'), which increases its width to l|- or 2 inches. 

 It then passes over the pastern joint, the coronet bone and 

 coffin joint, and is inserted into the pyramidal process of the 

 OS pedis. It is attached to all the bones of the foot, with the 

 exception of the navicular, and to the anterior surfaces of their 

 capsular ligaments, while it is held in position both by the rein- 

 forcing bands received from the superior sesamoidean ligament 

 and by the band-like ligaments which run to it from the 

 lower end of the suffraginis bone. 



The masses of muscle of which the extensor pedis tendon is 

 a continuation are termed the extensor pedis muscle. 



2. The Flexor Pedis Perforatus Tendon 

 (Figs. 26, &, and 27, a) 



Courses down the posterior surface of the great metacarpus, 

 and covers the other flexor tendon. At the point where the 

 two sesamoid bones form a gliding surface (fig. 26,/), the tendon 

 becomes broader and flatter, somewhat concave on its anterior 

 surface, and some of its fibres form a ring (fig. 26, h'), by which 

 it is attached to the flexor pedis perforans (a'^^), which lies 

 immediately in front of it. It then passes behind the suffra- 

 ginis bone, still covering the perforans tendon, and somewhat 

 below the middle of this bone divides into two limbs (figs. 26, 6", 

 and 27, b), permitting the passage of the perforans tendon, and 

 becomes attached on either side to the lateral surface of the 

 coronet bone. At this point it is difficult to divide the tendon 



