116 



HAND-BOOK OF PHYSIOLOGY. 



brum (5, Fig. 328), and the inferior crura (formed by the prolonged res- 

 tiform bodies) connect it with the medulla oblongata (3, Fig. 328). 



Structure. The cerebellum is composed of white and grey matter, 

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



FIG. 328. Cerebellum in section and of fourth ventricle, with the neighboring 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 crus or 

 peduncle of the cerebellum, formed by the restif orm body; 4, posterior pyramid; above this is the 

 calamus scriptorius; 5, superior crus of cerebellum, or processus e cerebello ad cerebrum (or ad 

 testes); 6, 6, fillet to the side of the crura cerebri; 7, 7, lateral grooves of the crura cerebri; 8, cor- 

 pora quadrigeinina. (From Sappey after Hirschfeld and Leveille.) 



so that a larger area may be contained in a given space. The convolutions 

 of the grey matter, however, are arranged after a different pattern, as 

 shown in Fig. 328. Besides the grey substance on the surface, there is, 

 near the centre of the white substance of each hemisphere, a small capsule 



FIG. 329. 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, so as to divide the superior pedun- 

 cle and pass nearly through the middle of the left cerebellar hemisphere. The olivary body has 

 also been divided longitudinally so as to expose in section its corpus dentatum. c r, crus cerebri: /, 

 fillet; g, corpora quadrigemina; sp, superior peduncle of the cerebellum divided; m p, middle pedun- 

 cle or lateral part of the pons Varolii, with fibres passing from it into the white stem; a v, continu- 

 ation of the white stem radiating toward the arbor vitae of the folia; c d, corpus dentatum; o, 

 olivary body with its corpus dentatum; p, anterior pyramid. (Allen Thomson.) %. 



of grey matter called the corpus dentatum (Fig. 329, cd) resembling very 

 closely the corpus dentatum of the olivary body of the medulla oblongata 

 (Fig. 324, o). 



