160 



VETERINARY I'ATHOLOGY. 



e. g., leucocytes becoming pliagocytic toward other leucocytes. 

 Fixed tissue cells ma^• under some conditions become phago- 

 cytic towards leucocytes ; this ])erhaps is for the purpose of 

 obtaining nutrition for the fixed tissue cells. 



The Signs of Inflammation. — Inflammation may be recognized 

 in exposed tissues b^' the so-called "Cardinal signs:" redness, 

 swelling, increased temperature, pain and impaired function. 

 These signs are usualU- j-erceptible in the early stages of acute 

 inflammation, but thev may not be e\'ident throughout the entire 

 process. ?>Iild, chronic inflammation may not be accompanied hx 

 an\- fjf the abii\'e signs. These signs are yer\- variable in either 

 acute or chronic inflamniati' -n of internal organs. 



#»3 •«": "--- 









s engori^ed. 



kcducss I Rulxir ) is a coustanl sign in tlie early stages of 

 acute inflammation. It is the result of an excessiye amount of 

 blood in the vessels (if the affected area. 



Srodhiii/ ( funinr 1 is characteristic of acute inflammation. 

 It IS the result of the accumulation and retention (if the inflam- 

 matory exudate plvs the increased amount of blood in the part. 

 The extent ( :f the swelling is in a direct ratio to the density of 

 the tissue. Thus the swelling resulting from subperiosteal' in- 

 flammation may not be detected becau'se of its limited extent. 

 On the other hand, the swelling succeeding inflammation of 

 loose areolar tissue may be very extensive, as in cellulitis. The 

 swelling resulting from inflammation is usually firm, dense and 

 quite resistant in contradistinction to swelling resultino- from 



