32 LAMENESS OF THE HORSE 



vessels. If the injury be of sufficient extent, considerable ex- 

 travasation of blood will take place and the painfully swollen 

 parts necessarily impair locomotion. In such instances lymph 

 vessels participate in the disturbance, and the condition then be- 

 comes one wherein lymphangitis is the predominant disturbing 

 element. 



Angiomatous tumors are occasionally found affecting horses' 

 legs — usually the result of some injury ; and because of their size 

 or position, they mechanically interfere with function. Further- 

 more, when such tumors are located on the inner or flexor side 

 of joints, enough pain is occasioned that affected animals show 

 evidence of distress, usually by intermittent lameness. 



Horses do not suffer from distension of veins as does man, 

 that is, there is rarely to be seen a case wherein much disturbance 

 from this source exists. 



AFFECTIONS OF LYMPH VESSELS AND GLANDS. 



Inflamed lymph vessels and glands, the result of various causes, 

 is a rather common source of lameness of horses. When one con- 

 siders the proportion of tissue that is composed of lymph vessels 

 and glands, it is then obvious that inflammation of these struc- 

 tures should cause a painful affection of members, when so af 

 fected, and that marked lameness and, in some instances, general 

 constitutional disturbance such as anorexia, hyperthermia and 

 general circulatory disorder are to follow. 



Lymphangitis is most frequently occasioned by the introduc- 

 tion of septic material into the tissues; consequently, infectious 

 lymphangitis is more frequently observed than the non-infectious 

 type. 



Specific infectious forms of lymphangitis are seen in glanders 

 and in strangles ; infectious types of this disturbance are found 

 in many instances where, initially, a localized or circumscribed 

 infection has occurred — the contagium having been introduced 

 by way of an injury. An example of this kind is to be seen in a 

 wound perforating the tibial fascia, where the injury is inflicted 

 by means of a horse being kicked by another animal shod with 

 sharp shoe-calks. Cases of this kind invariably result in a septic 

 lymphangitis, and frequently lymphadenitis also occurs, for the 



