CHAPTER IX. 

 NECROSIS AND DEATH. 



NECROSIS. 

 DEFINITION 

 EriOLOGY. 



Suspended nutrition. 

 Tliermic. 



Burning. 

 Frce::ing. 

 CJiemic. 

 VARIETIES. 



According to cause. 

 Inanition. 

 Tliermic. 

 Clieniic. 

 According to character of necrotic tissue. 

 Coagulation. 

 L olliquatiou. 

 Caseation. 

 Gangrene. 

 Mummification. 

 Miscellaneous. 

 Senile. 

 Fatty. 

 Focal 

 .fack-sores. 

 TISSUES AFFECTED. 

 DISPOSITION OF NECROTIC TISSUE. 

 Absorption. 

 Exfoliation. 

 Encapsulation. 

 Sequestration. 

 EFFECTS. 



Necrosi.s is local death. It is death of a part of the livinfj body. 

 The term necrosis is applicable to the death of anv kind of tissue, 

 glandular, muscular, osseous, etc. Necrosis is usually a rapid 

 process, that is, it is sudden death of a part. Death of a cell or 

 a group of cells that have been previously affected with degen- 

 eration, i. e., a slow or lingering death, is termed necrobiosis. 

 Caries is a term used to designate necrosis of dentinal or osseus 

 tissue. 



Cells are constantly worn out and destroyed in physiologic 

 active tissues. The physiologic destruction of cells is not usu- 

 ally thought of as necrosis although the cause and manner of 

 death may be similar, and there may be no difference in the ap- 

 pearance of cells destroyed by physiologic and pathologic pro- 

 cesses. 



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