306 NORMAL HISTOLOGY. 



branched protoplasmic as well as nervous or axis-cylinder 

 processes ; while the former ramify among the cells of the granule 

 layer, the delicate nervous processes extend into the outer, 

 molecular layer, where they usually end by dividing into longitu- 

 dinal T-branches which stretch horizontally parallel with the boun- 

 daries of the zone. The processes of these cells are so delicate, as 

 well as so masked by the surrounding elements, that their existence 

 has been established only after the introduction of the recent methods 

 of Golgi, the results of whose investigations have been confirmed by 

 Ramon y Cajal, Kolliker, and others. Other nervous elements of 

 the granule layer are the sparingly-distributed multipolar cells, 

 much larger than the ones just considered, which resemble in struct- 

 ure and size the cells of Purkinje, and, like them, possess richly- 

 branched protoplasmic processes extending within the molecular 



FIG. 338. 



G 



Diagram representing cellular constituents of cerebellar cortex ; Golgi's silver staining : IV, white 

 matter ; O, G, outer and granule layers of gray matter; a, large cell of granule layer confined to gray 

 substance ; b, b' , small nerve-cells of granule layer (exaggerated for convenience), also limited to gray 

 matter; c, cell of Purkinje, sending axis-cylinder into granule layer and richly-branched processes 

 towards periphery ; e. similar cell seen in profile ; f, small nerve-cell of outer layer, limited to gray 

 matter; g, nerve-cell of outer layer, whose axis-cylinder process forms basket works (d, <?) around 

 body of cells of Purkinje ; at inner border of outer zone numerous horizontally ramifying branches 

 of nerve-fibres are seen. 



layer ; they differ in the distribution and form of the axis-cylinder 

 processes. The latter are directed towards the medulla, but, instead 

 of passing into the granule layer to become continuous with nerve- 

 fibres, the processes in question divide and subdivide into an arbor- 

 ization of great richness. The ramifications of the tw.o varieties of 

 nerve-cells of the granule layer, therefore, are distributed in a manner 

 directly opposed, the nervous processes of the small cells terminating 



