78 PEINCIPLES OP VETEEINABY SUKGEBY 



What is a complete fistula ? 



It represents an abnormal communication between two 

 natural cavities or canals. 



What is a purulent fistula ? 



It represents the sequel of a chronic, destructive, deep, 

 purulent inflammation, continued by necrosed tissues or 

 specific micro-organisms, discharging its purulent exudate 

 from a tubular tract. 



Name the more important purulent fistulae. 



In the horse, quittor, funiculitis chronica (scirrhous 

 cord), tooth fistula (lower premolar). In the dog, from upper 

 m.axilla, bony fistula, as from the sternum, ribs, pelvis; 

 inferior maxilla, coccygeal vertebrae. Fistula of the withers, 

 neck and poll, and from suppurative phlebitis. 



What is a secretory and excretory fistula 9 



The first one is a pathological communication between a 

 secretory organ and the body surface ; the second is an 

 abnormal canal between an excretory organ and the body 

 surface. 



Which secretory and excretory organs are more frequently 

 met with fistulous tracts P 

 In the cow, the udder or teat. In the horse, salivary 

 glands, cesophagus, pharynx, stomach and intestines, urethra, 

 between bladder and rectum or rectum and vagina. 



Which congenital fistula is of practical importance f 



The urinary fistula following wanting closure of the 

 urachus in the newly born. 



Describe the symptoms common to purulent fistula f 



Depending on the variety of fistula and locality involved. 



