PROGRESSIVE TISSUE CHANGES. 183 



WOUxND HEALING. 



DEFINITION 

 CLASSIFICATION. 

 Etiologv. 



Traumatic. 

 Thermic. 

 Chemic. 

 Location. 



Surface. 



Subsurface, ( Cephalic, cervical, thoracic etc ) 

 Character. ' 



Incised. 



Punctured. 



Lacerated. 



Contused. 



Stab. 



Gun shot. 



Bites. 

 Condition. 



Aseptic. 



Septic. 

 HEALING. 



Primary union. (First Intention.) 



Hemorrhage arrested. 



Approximation of zvonnd margins. 



Adhesion of zvound lips with e.vudafe. 



Multiplication of related cells. 



Vascularization. 



Epithelization. 

 Secondary union, (Second Intention.) 



Hemorrhage arrested. 



Immigration of leucocytes to H'ound margins. 



Infection. 



Suppuration. 



Granulation. 



Cicatrisation. 



Epithelication. 



The regeneration of the individual tissues has been discussed. 

 The simultaneous re.generation of the tissue-complex of an area 

 in which there has been previous tissue destruction constitutes 

 wound healing. A wound is the result of sudden interruption of 

 the continuity of tissue or tissues. Some have restricted the 

 term 'wound' to those conditions resulting from traumatisms ; 

 others confine it to injuries of soft tissue, and again some main- 

 tain that wounds occur only upon a surface. There is no good 

 reason for restricting the term, because both thermic and 

 chemic influences produce tissue destruction not distinguish- 

 able from wounds mechanicallv inflicted. A fracture is a break 

 in the continuity of osseous tissue and is repaired in the same 

 way as wounds of soft tissue. Rupture of the liver or spleen is 

 characterized by tissue destruction and regeneration, the entire 

 process being identical with that in surface wounds. Wounds 

 result from sudden and violent action. Thus ulcers or necrotic 



