STRUCTURE OF THE CEREBELLUM. 



241 



LESSON XLL 



STRUCTURE OF THE CEREBELLUM AND CEREBRUM. 



1. SECTIONS of the cerebellum vertical to the surface, (a) across the direction 

 of the laminae, (6) parallel with the laminae. 



2. Section across the whole of one hemisphere of the cerebrum of a monkey, 

 passing through the middle of the third ventricle. 



3. Vertical sections of the cerebral cortex, one from the ascending frontal 

 gyms, another from the occipital lobe, and a third across the hippocampal 

 gyrus and hippocampus. 



4. Transverse sections of the olfactory tract and bulb. 



In all these preparations make sketches under a low power of the general 

 arrangement of the grey and white matter, and also of the nerve-cells in the 

 grey matter. Sketch some of the details under a high power. 



[The preparations are made in the same way as those of the spinal cord.] 



The cerebellum is composed of a white centre, and of a grey cortex, 

 both extending into all the folds or laminae, so that when the laminae 

 are cut across, an appearance is presented of a white arborescence 



Fiu. 271. SECTION THROUGH ONE OF THE HEMISPHERES OF THE CEREBELLUM ACROSS 



THE LAMELL.E, TO SHOW THE MEDULLARY CENTRE AND ITS PROLONGATIONS INTO 

 THE LAMELLJS. 



covered superficially by grey matter. The white matter is in largest 

 amount in the middle of each cerebellar hemisphere (fig. 271). There 



Q 



