THE PONS AND THE CEREBELLUM. 



141 



of this section. The tegmcntum and the crusta, the latter per- 

 forated by the fihres of the pons, are arranged jnst as we saw 

 them in sections through the quadrigeminal region. 



A good many of the hands of fibres shown in the accom- 

 panying cut have not yet been described, because we have had 

 no opportunity to consider the system of fibres peculiar to the 



FIG. 85. 



Diagram of the course of fibres in the cerebellum to explain the origin of the cere- 

 bellar peduncles. Notice that they are composed of intra-ciliary, extra-ciliary, and 

 hemisphere fibres. This shown with 'peculiar distinctness in the right superior peduncle. 



Dend. Fasfrn, Dendritic tracts. 



Dirrrte .Sens. Bah n. Direct sensory tract. 



Haulie, Tegmeutum. 



Klfinh-S'-ilenstranif-B'thn, Lateral cerebellar tract. 

 Kreuzungs-zonen, Zone of decussation. 

 Vtiess, The fleece. 



cerebellum. We have seen that fibres pass through the three 

 peduncles into the cerebellum ; our knowledge of their course 

 is still very unsatisfactory, notwithstanding the fact that that 

 most skillful investigator, Benedikt Stilling, was for years occu- 

 pied in the study of this region. The diagram (Fig. 85) will, 

 in the simplest manner possible, give Stilling's views as to the 

 most important tracts of fibres.* It represents a frontal section 



*The fibres of the restiform bodies are given according to my own investigations, some- 

 what modified. 



