THE NERVOUS SYSTEM. 



117 



If a section be taken through the cortical portion of the cerebellum, 

 the following distinct layers can be seen (Fig. 330) by microscopic exami- 

 nation. 



(1.) Immediately beneath the pia mater (p m) is a layer of consider- 

 able thickness, which consists of a delicate connective tissue, in which are 



iVi ivAVS 



Bjiwifli 



FIG. 330. Vertical section 9f dog's cerebellum; p m. pia mater; p, corpuscles of Purkinje, which 

 are branched nerve-cells lying in a single layer and sending single processes downward and more 

 numerous ones upward, which branch continuously and extend through the deep "molecular layer" 

 toward the free surface; g, dense layer of ganglionic corpuscles, closely resembling nuclear layers 

 of retina; /, layer of nerve-fibres, with a few scattered ganglionic corpuscles. This last layer (f f) 

 constitutes part of the white matter of the cerebellum, while the layers between it and the free sur- 

 face are grey matter. (Klein and Noble Smith.) 



scattered several spherical corpuscles like those of the granular layer of the 

 retina, and also an immense number of delicate fibres passing up toward 

 the free surface and branching as they go. These fibres are the processes 

 of the cells of Purkinje. (2.) The Cells of Purkinje (p). These are a 



