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CHAPTER XII. 

 NERVE INJURIES. 



The effects of nerve section — Epicritic, protopathic, and deep 

 sensibility — Causation of tropliic lesions — Diagnosis of particd 

 nerve section — How degenerated nerve is regenerated — The 

 results of primary and secondary nerve suture — Methods of dealing 

 with wide gaps. 



IT will be necessary in compressing this immense 

 subject into the limits of a single chapter simply 

 to mention the better-known phenomena, and refer 

 to the original monographs those who wish to become 

 more fully acquainted with the interesting results 

 here alluded to, 



THE EFFECTS OF DIVISION OF A NERVE. 



The effects of division of a nerve are as follows : — 



(a). Flaccid paralysis of the muscles suppHed, with 

 loss of reflexes. 



{h). Loss of epicritic sense over the anatomical 

 area suppHed by the nerve. Loss ot protopathic 

 sense over an area, usually smaller and encircled by 

 the former. Sometimes loss of deep sensibihty over 

 an area smaller still. (These terms are explained 

 subsequently.) 



(c). Reaction of degeneration. 



{d). Wasting of muscles. 



{e). Paralysis of the pilomotor nerves, so that the 

 hairs he irregularly, and " goose skin " does not so 

 readily occur. 



