65 

 celL-bodies are iispose-i in a thin stratun interoalatei bet»feen 

 the molecular and the granalar layers. At tnose points vihere 

 th3 granular layer is absent, the Parkinje cells come into 

 iirect contact with the layer of basal nerv^e-fibres, instead.. 

 As to superficial distribition, the neurones follow a well- 

 dofined rule (Pig. 12, p. 1. ) . They are most numeroas on the 

 sides of a cerebellar fold, often several cells in depth here, 

 and not infrequently having their cell-bodies in contact. At 

 the summit of the fold, there are wider spaces between the 

 individual cells; and for a small space at the bottom of a 

 fold, the cells are absent altogether. The posterior fold of 

 the cerebellum has a part of its area without Purkinje neurones. 



Pig. 13 illustrates the features of external morphology 

 characteristic of a neurone of Purkinje. The cell-body is 

 situated, as already noted, at the base of the molecular layer. 

 The dendrites, therefore, grow upward into the molecular lay- 

 er, and to their presence here is due, in part, the marked 

 striation perpindicular to the surface which is so character- 

 istic of this superficial zone. 



The axone always arises from the base of the cell-body, 

 and it pursues a horizontal course for some distance. It then 

 turns downward through the granular layer to enter the system 

 of fibres leaving the cerebellum. Where the granular layer is 

 absent, the axone may be traced into the layer of basal fibres 

 for a still greater horizontal course. The axone is remark- 

 able for the fact that it does not give off collateral branches. 



