ABSCESS 69" 



excision or amputation, is called for (gangrene of the tail^ 

 udder, ear, etc.) 



ABSCESS. 



What is an abscess P 



It is a newly formed cavity circumscribed by embryonic? 

 tissue and containing pus. 



Describe the formation of an abscess. 



First, pus producing bacteria invade a part. The smalt 

 vessels of this part are distended with blood or even leuco- 

 cytes, the connective tissue fibres are swollen, and the lymph, 

 spaces are filled with exudate containing enormous numbers- 

 of levicocytes ; the fixed cells of the tissue also undergo- 

 changes, become nucleated, resembling leucocytes. In the- 

 meantime the cocci have multiplied and massed together, and 

 by their peptanizing action upon the fibrin of the exudation 

 and intercellular substance the centre of the inflamed tissue- 

 Kquefies and the abscess is ready. The abscess cavity is- 

 walled in by a zone of granulation tissue, this embryonic^ 

 tissue acting as a protective layer between the infected parts- 

 and the adjacent healthy tissue territory, the abscess becom- 

 ing larger by liquefaction of the granulation tissue front 

 within to without. When the inflammation finally reaches^ 

 the surface, an elevation due to fluid pressure from within 

 forms, which from tension and liquefaction becomes thinner- 

 stud thinner, breaks, and the contents of the abscess cavity- 

 evacuate spontaneously. 



What classes of bacteria are mainly concerned in abscess- 

 formation in the horse f 



Streptococci and Staphylococci. The latest researches. 



