PART SECOND. 



NERVOUS SYSTEM. 



I. NERVOUS SYSTEM IN GENERAL. 



1. Anatomical Elements. The nerve globule partakes 



of the general proper- 

 ties of the living glob- 

 ule ; its dimensions 

 are very small (one to 

 eight-hundredths of a 

 millimetre) ; but it at- 

 tains in certain regions 

 larger proportions, and 

 may even with a little 

 care be seen with the 

 naked eye. The nerve 

 globules are looked 

 upon as cells having an 

 envelope (?) enclosing 

 protoplasmic elements, 

 a nucleus, and a nucle- 

 olus. 



These globuies are 

 generally stellate, that 

 is to say, provided with 

 prolongations (Fig. 7) ; 

 at this present time 

 globules having one 



Fig. 7. -Nerve elobules, their prolongationg, prolongation are called 

 nuclei, and nucleoli.* .7.1 i 



unipolar, those having 

 two prolongations, striking out in the same direction or 



* fl,, From the deep portion of the gray substance of the convolutions of the 

 cerebellum. eZ, Cells from the posterior portion of the gray substance of spinal 

 cord (dorsal). In all these globules the prolongations are more or less torn. 



