lo THE SURGICAL ANATOMY OF THE HORSE 



inferior extremity of the radius will, however, be found to be imme- 

 diately subcutaneous between the tendon of the extensor pedis (22) 

 and that of the extensor suffraginis (25). 



Between the knee and fetlock almost the whole of the outer 

 surface of the external small metacarpal bone (32) is represented, as 

 is also the shaft of the large metacarpal, excepting that portion 

 which is concealed by the tendons of the extensor pedis and 

 extensor suffraginis muscles. 



Below the fetlock we see the os suffraginis (46), the greater 

 part of the front and lateral aspect of this bone being visible, 

 together with the external prominence at its lower extremity. 



The Ligaments 



Only two ligaments are shown in the plates representing this 

 aspect of the limb. 



The Superior Sesamoidean or Great Suspensory Ligament (44). — This 

 first makes its appearance about four inches below the knee. It is 

 visible owdng to the body of the outer splint bone having become 

 so much thinner than it is above this point. 



The ligament runs down the limb in the channel formed by the 

 large and two small metacarpal bones. Just above the fetlock it 

 splits into two parts. The outer division is plainly represented (44J. 

 It runs round the outer lateral aspect of the fetlock, and gives off 

 a slip of insertion to the sesamoid bone of its side. It then runs 

 obliquely downwards and forwards across the shaft of the first 

 phalanx to the front of the limb, where it terminates by uniting 

 with the tendon of the extensor pedis. 



The Subcarpal or Check Ligament. — This is placed behind the 

 suspensory ligament just below the knee. Like the former ligament, 

 Its upper portion is concealed by the greater thickness of the upper 

 extremity of the small metacarpal bone. It is the downward con- 



