650 



STRUCTURE OF THE CEREBELLUM 



[CH. XLV. 



external layer) forms a felt work of fibrils round the body of the 

 cell. 



FIG. 472. Vertical section of dog's cerebellum; pm, pia mater; p, cells of Purkinje, which are 

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

 numerous ones upwards, which branch continuously and extend through the external " molecular 

 layer" towards the free surface; g, dense (granular) layer of small nerve-cells; /, layer of nerve- 

 fibres, with a few scattered nerve-cells. This last layer (ff) constitutes part of the white matter of 

 the cerebellum, while the layers between it and the free surface are grey matter. (Klein and Noble 

 Smith.) 



The cells of the internal layer of grey matter are small ; their 

 dendrites intermingle with those of neighbouring cells ; their axons 

 penetrate into the external layer, but their final destination is 

 uncertain. Eamifying among these cells are fibres characterised by 



