THE NEURONE THEORY 



573 



described not only in the cell body, but extending throughout the course of 

 the processes and, in fact, from cell to cell. We are not in a position at the 

 present time fully to determine what bearing these neurofibrillae have on our 

 accepted theories of nerve function, other than that they are assumed to be 

 the conducting elements. 



13 



FIG. 357. Morphological changes of nerve cells during function activity and during 

 recuperation, i. Normal resting Purkinje cell. 2 to 9. The main stages in progressive 

 activity. 10 to 13. The regular course of recovery. (Dolley.) 



The Neurone Theory. Our knowledge of the function of the ner- 

 vous system is best explained on the basis of the neurone theory, which con- 

 siders the neurone as a physiological unit. By this view each gross divi- 

 sion of the nervous system is supposed to consist of a large number of in- 



