GENERAL PHYSIOLOGY OF THE CEREBRUM. 189 



In the motor area there are numerous connections by afferent 

 fibers, association tracts, with other parts of the brain. By 

 this means the motor area, without doubt, is brought into rela- 

 tion with many other parts of the cortex, and the sensations or 

 perceptions aroused elsewhere may react upon the motor paths. 

 A voluntary movement, however simple it may be, is a psychological 

 act of some complexity. The mental processes that lead to and 

 originate the motor discharge cannot be located in the cortex, but 

 the immediate origin of the- motor impulse lies most probably, in 

 the areas along the anterior margin of the fissure of Rolando. 



