CH. XLV.] THE CEREBELLUM. 639 



masses of grey matter, the largest of which, called the coryms 



Fig. 472. Cerebellum in section and fourth ventricle, with the neighbouring parts, 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 1 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 scriptorius; 5, 

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

 grooves of the crura cerebri ; 8, corpora quadrigemina. (From Sappey after Hirschf eld 

 and Leveille'.) 



dentatum (fig. 473, cd), resembles very closely the corpus dentatum 

 of the olivary body of the medulla oblongata in appearance. 



Fig. 473. Outline sketch of a section of the cerebellum, showing the corpus dentatum. 

 The section has been carried through the left lateral part of the pons, HO as to divide 

 the superior peduncle and pasx nearly through the middle of the left cerebellar hemi- 

 sphere. The olivary body has also been divided longitudinally so as to expose in 

 ection its corpui dentatum. er, crus cerebri ; /, fillet ; a, corpora quadrigemina ; 

 if, superior peduncle of the cerebellum divided ; m p, middle peduncle or lateral part 

 of the pons Varolii, with fibres passing from it into the white stem ; a v. continuation 

 of the white stem radiating towards the arbor vitt of the folia ; c d, corpus den- 

 tatum ; o, olivary body with its corpus dentatum ; p, pyramid. (Allen Thomson.) f . 



If a section is taken through the cortical portion of the 

 cerebellum, the following distinct layers can be seen (fig. 474) by 

 microscopic examination. 



