210 



THE NERVOUS SYSTEM OF MAN 



163. The Location of the Nerves. — The nerve fibers 

 which have the same work to do occupy certain definite 



places in the brain 

 or spinal cord. So 

 a student of the nerves 

 can tell the route 

 which the stimulus 

 arising from feeling 

 a pencil must travel 

 before reaching that 

 part of the brain where 

 it is interpreted as a 

 pencil ; or the route 

 over which the stimu- 

 lus arising from tast- 

 ing candy must pass 

 before it is known to 

 be candy. When we 

 see the pencil or the 

 candy, the route over 

 which the sight stimuli 

 of these two objects 

 travel is not the same 

 as that of the feeling 

 of the pencil or tasting 

 the candy. The nerve 

 cells which interpret 

 the stimulus arising 

 from feeling the pencil 

 or from tasting the 

 candy or seeing the 

 pencil and the candy 

 are probably not the same. We may say, therefore, 

 that the spinal cord and brain are made up of many 



Figure 222. — Nervous System of Man. 



