THE PONS AND THE CEREBELLUM. 



135 



3. The pyramis (pyramid). 



4. Tuber valvulse, far back, and extending partly over on 

 the dorsal surface. 



In the hemispheres lie 



1. The flocculus, on each side of the nodulus. 



1 2. The tonsilla, on each side of the uvula. 



3. External to the last mentioned, the lobus cuneiformis. 



4. Behind this, the posterior lower lobe, lobus posterior 

 inferior. Its anterior part is called the lobus gracilis and its 

 posterior part the lobus semilunaris inferior. 



FIG. 80. 



The three peduncles arising in the mid-brain, the porm, and the spinal cord, and pass- 

 ing into the cerebellum. After Hijschfeld and Leveille (Sappey). Emerging from 

 beneath the corpora quadrigemina (8; can be seen the superior eerebellar peduncles (5) ; 

 t'n Mil the ventral surface come the middle peduncles or arms of the nous (7), and from 

 tlic spinal cord ascend the restiform bodies or inferior peduncles (3). On entering they 

 decussate with the superior peduncles. Notice, too, the form of the rhomboidal fossa (1), 

 the stria? acusticae (2), the clavae of the funiculi gracilis (4). At 6 is the lillet. 



Iii the above cut you see the three bundles of medullary 

 fibres just mentioned passing to the cerebellum on each side. 

 These extend to the central white substance of the hemispheres, 

 and this in turn is continued into the medulla of the lobules 

 and ridges. These ridges are covered with a gray cortex, which 

 follows closely all the elevations and depressions of the surface, 

 so that its extent is relatively much greater than would be sup- 

 posed from the size and shape of the cerebellum. 



