CwAP. XXm.] OF THE HUMAN BRAIN. 4G5 



Peduncles are ' outgoing ' or motor fibres — a conclusion, 

 which is harmonious with other evidence. Whether, how- 

 ever, there are points of junction with cerebral motor 

 fibres of the opposite side in, or in the neighbourhood 

 of, the ' pons ' itself, as Luys imagines ; or whether such 

 cerebellar fibres really pass upwards to the cells of the 

 Corpora Striata — or even beyond them, to some portions 

 of the Cortex of the Cerebral Hemispheres — are details 

 which cannot at present be decided. 



6.— The Minute Structure of the Grey Matter of the 

 Cerebellum. 



The cortical Grey Matter is uniform in appearance 

 all over the innumerable folds of the surface of the Cere- 

 bellum. To the naked eye it is divisible into two layers 

 (fig. 167), an outer clear grey, and an inner, as well as 

 narrower, greyish red layer. Within the grey layer of 

 each fold is a stem of white substance. 



In the deepest part of the outer layer there is a single 

 row of large ganglion cells yJuTo ^^ ¥0^0 ^^ ^^ ^^^^^^ ^^ 

 diameter, whose large branching arms ramify throughout the 

 whole of this stratum, becoming finer as they approach 

 the surface (fig. 167, b, b). The ultimate ramifications of 

 these nerve processes, together with a kind of connective 

 tissue substance, unite to form a most delicate matrix of 

 fibres, amidst which are interspersed a number of small 

 corpuscles. These are either mere nucleoid bodies or 

 small angular cells, and like the similar corpuscles in the 

 grey matter of the Cerebrum it is impossible to say which 

 should be regarded as belonging to the connective tissue, 

 and which have a right to the title of nerve elements. 

 Many of them, as W. H. 0. Sankey has ascertained, are 

 in direct continuity with the ramifications of the ganglion 

 cells. Running along the inner part of this layer across 



