FUNCTIONS OF THE CEREBELLUM. 



525 



hemisphere, a small capsule of grey matter called the 

 corpus dentatum (fig. 148, cd), resembling very closely the 



Fig. 147.* 





corpus dentatum of the olivary body of the medulla oblon- 

 gata (fig. 148, j). 



The physiology of the cerebellum may be considered in 

 its relation to sensation, voluntary motion, and the instincts- 

 or higher faculties of the mind. It is itself insensible to 

 irritation, and may be all cut away without eliciting signs 



* Fig. 147. View of cerebellum in section and of fourth ventricle, 

 with the neighbouring parts (from Sappey after Hirschfeld and Le- 

 veille'). i, median groove of fourth ventricle, ending below in the 

 calamus scriptorius, with the longitudinal eminences formed by the 

 fasciculi teretes one on each side ; 2, the same groove, at the place 

 where the white streaks of the auditory nerve emerge from it to cross 

 the floor of the ventricle ; 3, inferior crus or penduncle of the cere- 

 bellum, formed by the restiform body ; 4, posterior pyramid ; above 

 this is the calamus scriptorius ; 5, superior crus of cerebellum, or pro- 

 cessus a cerebello ad cerebrum (or ad testes) ; 6, 6, fillet to the side of 

 the crura cerebri ; 7, 7, lateral grooves of the crura cerebri ; $, corpora 

 quadrigemina. 



