THE CEBEBELLUM 



517 



matter is distributed over the surface of the convolutions, and 

 incloses the medullary white matter. The latter consists of medul- 

 lated nerve fibres passing to or from the cortical cells. 



In section the cortex presents two distinct layers separated 

 by a border line of large pyrif orm nerve cells, the cells of Pur- 

 kinje. The outer layer, molecular stratum, contains many cell 



b c 



c c 



FIG. 400. FROM A SECTION OF THE CEREBELLAK CORTEX OF MAN. 



o-a, pia mater ; ft-i, molecular layer ; c-c, granular layer ; d-d, white matter of the 



medulla. Nissl's stain. Photo, x 38. 



processes but few cell bodies. The inner, granular or nuclear 

 layer, on the other hand, consists almost entirely of small nerve 

 cells with prominent nuclei, together with glia cells. 



The Nuclear Layer. The nerve cells of the granular or nuclear 

 layer contain large spherical nuclei which are surrounded by the 



