804 



THE NERVE SYSTEM 



substance to establish connections with other folia within the cerebellum or 

 with more distinct brain structures. 



The granular or ental layer is characterized by containing numerous small nerve 

 cells or granules of a reddish-brown color, together with many nerve fibrils. Most 

 of the cells are nearly spherical and provided with short dendrites, which spread 

 out in a spider-like manner in the granular layer. Their axones pass outward 

 into the molecular layer, and, bifurcating at right angles, run horizontally for 

 some distance. In the outer part of the granular layer are also to be observed 

 some larger cells, of the type termed Golgi cells (Fig. 658). Their axones undergo 

 frequent division as soon as they leave the nerve cells, and pass into the granular 

 layer, while their dendrites ramify chiefly in the molecular layer. 



PURKINJEAN CELL 



AXONE OF 

 GRANULE CELL. 

 CUT TRANS- 

 VERSELY 



SMALL CELL 

 OF MOLECULA 

 LAYER 



EASKET CELL- 



MOLECULAR 

 LAYER 



GOLGI CELL 



GRANULAR 

 LAYER 



NEUROGLIA 

 CELL 



I I AXONE OF 



PURKINJEAN 

 j CELL 



'TENDRIL FIBRE 

 MOSSY FIBRE 



FIG. 658. Trans-section of a cerebellar folium. (Diagrammatic after Cajal and Kolliker.) 



Finally, in the gray substance of the cerebellar cortex fibres are to be seen which 

 come from the white centre and penetrate the cortex. The cell origin of these 

 fibres is unknown, though it is believed that it is probably in the gray substance of 

 the spinal cord. Some of these fibres end in the granular layer, by dividing into 

 numerous branches, on which are to be seen peculiar moss-like appendages; hence 

 they have been termed by Ramon y Cajal the moss fibres (Fig. 658); they form 



