90 



THE CEREBELLUM. 



reached these they break up into a close feltwork of filaments (terminal ramification) 

 which surrounds the corpuscles of Purkinje, and with similar ramifications from 

 other cells, envelopes the corpuscle in a sort of basket-work of nerve-filaments. 

 This basket-work extends even for a short distance along the axis-cylinder process 

 of the corpuscle (fig. 66). 



The " granules " of the inner, or rust-coloured, layer of the grey matter are 

 mostly small nerve-cells, nearly spherical, and provided with several small proto- 

 plasmic processes, which soon end in close bunch-like terminal ramifications within 

 the layer (fig. 64, V). But the axis-cylinder process is of far greater extent, and 

 taking a peripheral course, passes vertically beyond the corpuscles of Purkinje for 



Fig. 66. BASKET-WORK OP FIBRES AROUND TWO CELLS OF 

 PURKINJE. (Ramon y Cajal.) 



a, axis-cylinder or nerve-fibre process of one of the corpuscles 

 of Purkinje ; b, fibres prolonged over the beginning of the axis- 

 cylinder process ; c, branches of the nerve-fibre processes of 

 cells of the molecular layer, felted together around the bodies 

 of the corpuscles of Purkinje. 



a variable distance into the molecular layer, where 

 it becomes connected with the horizontal fibres of 

 that layer (fig. 64, e) in the manner before described. 

 A few of the " granules " are larger ; their cell- 

 bodies lie chiefly in the outer part of the granule- 

 layer, near the cells of Purkinje. They are somewhat 

 stellate, and have long, ramified, protoplasmic pro- 

 cesses ; these may penetrate both into the white 



centre of the lamina, and into the molecular layer. Their axis-cylinder processes 

 are singularly branched, losing themselves in a ramification which may extend 



Fig. 67. TRANSVERSE SECTION OF A CEREBELLAR LAMELLA OF THE ADULT RAT SHOWING THE FIBRES 



WHICH PASS FROM THE WHITE CENTRE TO THE GREY MATTER. (Ramon y Cajal. ) 



A, molecular layer ; B, cells of Purkinje ; C, granule-layer ; D, white substance. 

 e /> ff, fibres which end in plexuses enveloping the principal protoplasmic processes of the cells 

 of Purkinje ; 6, an enveloping plexus ; c, body of cell of Purkinje ; m, "moss '' fibres. 



throughout the whole thickness of the granule-layer ; it is not certainly known if 

 they are medullated, nor if they are connected with fibres of the white centre. 



