THE LIMB IN SECTION 35 



tendon is now seen to be placed in front of the perforans, and to run to 

 its insertion into the upper extremity of the os corona. 



The front of the fetlock joint is closed by a strong anterior common 

 ligament, which is plainly shown as being attached superiorly to the 

 anterior aspect of the lower extremity of the large metacarpal bone, and 

 inferiorly to the same aspect of the pr9ximal end of the suffraginis. On 

 the front of the ligament is a small synovial bursa which facilitates the 

 gliding of the extensor pedis tendon over the ligament, whilst the 

 deep face of the ligament gives support to the synovial membrane of 

 the joint. 



The distal extremity of the first phalanx forms a curve with the 

 convexity directed downwards, and is accommodated in a corresponding 

 concavity at the upper extremity of the os corona. The curve indicating 

 the concavity mentioned is continued upwards posteriorly on to the 

 anterior face of the complementary cartilage which projects upwards 

 from the superior extremity of the back of the os corona behind the 

 pastern joint. At the front of the joint the extensor pedis tendon comes 

 into close relationship to the articulation. There is no anterior common 

 ligament to this joint. The tendon just mentioned takes its place, and 

 affords support by its deep face to the synovial membrane. 



Plate IX. represents the appearance of a transverse section across the 

 near fore limb, which is taken about two inches inferiorly to the seat 

 of median neurectomy. Near the middle of the plate the radius is 

 represented, and articulated to the outer half of its posterior aspect is the 

 ulna, the outline of the former being elliptical, with its long axis 

 directed transversely, whilst that of the latter is approximately triangular, 

 the base of the triangle being directed forwards and opposed to the back 

 of the radius. Lying on the back of the radius and near its inner side 

 we have the Median Nerve, and it will be noticed that the nerve is in 

 direct relationship to the bone. Posteriorly the nerve is related the 

 flexor metacarpi internus muscle, and also in part to a large vein which is 

 one of the posterior radials. Deeply-seated to this vein here is the 



