212 PRINCIPLES OF PHYSIOLOGY 



layers. Round these neurones fibres that come 

 from below form arborizations. From these, 

 fibres proceed that find their way to the 

 cerebral hemisphere on the opposite side and 

 probably end in the motor centres. The 

 function of the cerebellum seems to be to 

 arrange these sensory impulses and to transmit 

 them to the special motor centre in the cortex 

 of the cerebrum, so as to bring about the 

 co-ordination that is necessary for the required 

 movement. Probably they do this by setting 

 into action motor centres for the movements 

 of special muscles. There is a faint analogy 

 in the card of a Jacquard loom, which so 

 arranges the threads as to enable the other 

 mechanisms to weave the desired pattern. 

 Finally, the cerebellum receives impulses 

 from the retina and from the internal ear, 

 and more especially from the semi-circular 

 canals of that organ. Such impressions from 

 these sense organs assist in the co-ordination 

 of movement, and in the maintenance of 

 equilibrium. 



123. It cannot be too strongly emphasized 

 that our knowledge of the physiological 



