FUNCTIONS OF THE CEREBELLUM 



565 



be touched, pain is indicated; and, if the restiform tracts of the medulla ob- 

 longata be stimulated, the most acute suffering appears to be produced. 



These phenomena may properly be ascribed to the activity of the cerebral 

 cortex, since the number of collaterals on the fibers that pass to cerebellar tracts 

 is very great, and impulses arising from their stimulation may reach the sen- 

 sorium by paths other than through the cerebellum. 



Cranial Nerve 

 Ur ) 



FIG. 306. Scheme of Principal Ascending Cerebro- Spinal (black) and Cerebellar (red) Con- 

 duction Paths. (Modified from Hardesty in Morris Anatomy.) 



The experiments of Longet and many others agree in supporting the view 

 that no stimulation of the cerebellar cortex leads to localized muscular con- 

 tractions. In other words, there is no localization in the cerebellar cortex 

 as in the cerebrum, the cerebellum apparently acting as a whole. If the cere- 

 bellum be removed, as was done by Flourens and numerous later physiologists, 

 a very profound disturbance in motor functions occurs. With the removal 



