XI THE CEREBRAL CORTEX 513 



in an ordinarily stained section. But by employing special 

 methods of staining many further details come into view, 

 and putting all these together we are justified in con- 

 structing the preceding diagrammatic Figure 164 to show 

 the nature and relationships of the cells of the cerebellar 

 cortex and of its two layers to the fibres of the central 

 white matter. 



In this figure the cells which call for special attention 

 are the following. The cell of Purkinje (1) with its 

 central axon (a) and peripheral dendrites (d). The 

 basket-cell (3) with its axon («) and baskets (h) ; the 

 baskets in reality surround the bodies of cells of Purkinje 

 which, for the sake of clearness are not showm in the 

 diagram. The spider-cell (2) in the nuclear layer with its 

 axon (a) running into the molecular layer and dendrites (d). 

 Also in addition to the fibre derived from the inner end of 

 the cell of Purkinje it is important to notice the moss-fibre 

 (m) whose outer end terminates by branching in the 

 nuclear layer and the tendril-fibre (t) which passes 

 further outwards but ends similarly in the molecular layer. 

 The direction in which impulses are supposed to travel 

 along these fibres is indicated by arrows. 



The Cerebral Cortex. — The structure of the superficial 

 grey matter of the cerebellum is practically the same in 

 each part of the cerebellar cortex. In the cerebrum, on 

 the other hand, the details of structure vary not incon- 

 siderably according to the region of the cortex from 

 which a section is prepared. Into these differences we 

 cannot enter, but must content ourselves with a somewhat 

 diagrammatic description and figure in illustration of the 

 general structural arrangement of the cells and fibres of 

 the cortex as a whole. 



The grey matter is permeated throughout its whole 

 thickness by a neuroglia which is essentially the same 

 as that of the rest of the central nervous system. 

 This forms the supporting tissue in which the nerve 

 cells of the cortex are imbedded and through 



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