CHAPTER XLVII 



STRUCTURE OF THE CEREBELLUM 



THE cerebellum is composed of an elongated central portion or lobe, 

 called the vermis or vermiform process, and two hemispheres. Each 

 hemisphere is connected with its fellow by means of the vermiform 

 process. 



The cerebellum is composed of white and grey matter, the latter 



Fia. 419. Cerebellum in section and fourth ventricle, with the neighbouring parts. 1, 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 peduncle of the 

 cerebellum, formed by the restiform body ; 4, funiculus gracilis ; above this is the calamus scrip- 

 torius ; 5, superior peduncle of cerebellum ; 6, 6, fillet to the side of the crura cerebri ; 7, V, lateral 

 grooves of the crura cerebri; 8, corpora quadrigemina. (From Sappey, after Hirschfeld and 

 Leveille.) 



being external, like that of the cerebrum, and like it, infolded, so 

 that a larger area may be contained in a given space. The convolu- 

 tions of the grey matter, however, are arranged after a different 

 pattern, as shown in fig. 419. The tree-like arrangement of the white 



