THE PONS AND THE CEEEBELLUM. 



323 



line is the nucleus tegmenti (nuc. fastigii). These nuclei are best brought 

 into view in a nearly-horizonal section through the cerebellum, as is shown 

 in Fig. 209, taken from Stilling's Atlas. 



In such a section one may note in the middle the white substance of 

 the vermis and the nucleus tegmenti; anterior to this a decussation, the 

 anterior commissure of the vermis. To the right and left lies the white 

 matter of the hemispheres, in which may be seen the nuc. globosus, the 

 embolus, and the folded medullary lamina of the nuc. dentatus. The deep 

 clefts in the surface correspond to the fissures between the lobes. Between 



Fig. 209.^ — Horizontal section through the cerebellum. The section passes 

 through the region under the eorp. quad. (T) then through the ant. cerebellar 

 peduncles (B), and between these through the lingula {A). Above this lies the 

 nuc. tegmenti (m), to the left of the nuc. globosus (Ng.), the embolus (EmJ).), and 

 still farther to the side within the hemisphere the corpus dentatum cerebelli {Cdc). 

 Com., Anterior decussation-commissure. Sera, Fibrse semicirculares. (After B. 

 ' Stilling.) 



the peduncles {B R) upon the velum medullare anticum lies the lingula 

 {A), cut also in the horizontal plane. 



All of the nuclei here seen in the white substance are connected with 

 each other through bands of gray matter. Their relation to the fiber-system 

 of the white substance is almost wholly tmknown. 



If one make a frontal section just posterior to the point where the 



