20? 



THE ESSENTIALS OF HISTOLOGY 



Other isolated grey nuclei lie in the white matter of the middle 

 lobe. 



The grey matter of the cerebellum consists of two layers (fig. 237). 

 The inner one (that next the white centre) is composed of a large 

 number of very small nerve-cells (granule layer, d). The outer layer 





==^*r^?^r ^^S^^r^--*-- 



FIG. 237. SECTION OF CORTEX OF CERE- 

 BELLUM. 



a, pia mater ; %, external layer ; c, layer of cor- 

 puscles of Purkinje ; d, inner or granule 

 layer ; e, medullary centre. 



FIG. 238. PROCESSES OF THE CORPUS- 

 CLES OF PURKIXJE, CONNECTED BY 

 THEIR FINER BRANCHES WITH COR- 

 PUSCLES OF THE OUTER LAYER OF 

 THE CEREBELLAR CORTEX. (Highly 



magnified.) 



a, a, processes of the corpuscles of Purkinje;. 

 6, a branch from one of them, whi^h is con- 

 nected with two of the corpuscles of the 

 outer layer ; c, c, scattered branched cor- 

 puscles of this layer. 



(b] is thicker, and is formed of neuroglia, with rounded and angular 

 small nerve-cells and neuroglia-cells scattered through it. Into its 

 outer part processes of the pia mater conveying blood-vessels pass 

 verticaUy, and there are also in this part a number of long taper- 

 ing cells, somewhat like the Miillerian fibres of the retina. Lying 



