36 PRINCIPLES OF PHYSIOLOGY 



ties in the centres. These activities may 

 cause other impulses to stream outwards to 

 the various organs and thus stimulate them, 

 or they may, as in the higher brain centres, 

 be associated with various states of con- 

 sciousness, such as sensations, emotions or 

 intellectual and volitional processes. Thus 

 the whole body is bound together, and controlled 

 and regulated, by the nervous system. 



