6 PRINCIPLES OP VETEEINABY SUEGEBY 



Prognosis— Depends on the part involved and extent of 

 the lesion. Since there is more or less tendency to necrosis, 

 this fact must be borne in mind in making a prognosis. 



What part of the body is often involved ? 



In the horse, the eyelids, cronp, breast and hind legs and 

 false nostril ; in the dog, the cornea when fighting with cats. 



Describe contused wounds. 



Causes— The action of a blunt instrument, as kicks, falls, 

 running against unyielding objects, coronary caulks, lying 

 for some time on hard and rough ground ; rope burns. 



Characteristics — When of a superficial nature the upper 

 layers of the' skin only are removed : abrasion, excoriation. 

 Deep contused wounds exhibit little or no bleeding, as the 

 separation of the intima and media from the adventitia of 

 the bleeding vessel closes the lumen of the vessel on the same 

 principle that the emasculator or ecraseur prevents bleeding. 

 The edges are irregular, discolored, feel cold ; the neigh- 

 borhood is swollen ; the wound contains partially detached 

 tissue and bloodclots. 



Prognosis — There is always sloughing, and the prognosis 

 is based to a great extent upon the possibility of securing 

 perfect drainage and thus preventing septic infection. 



To what class of wounds do those created by the teeth of 

 animals belong ? 



The bites of dogs and cats are more common than those 

 of the horse or ox. Such wounds are either punctured, 

 contused or lacerated, or a combination of the above. Dog 

 bites quite often cause complicated fractures. 



Describe gunshot wounds. 



Cause— Projectiles, as buck and bird shot, pistol and 

 rifle balls. 



