182 STRUCTURE OF THE NERVOUS SYSTEM, BY MAX SCHULTZE. 



and origin of this axis cylinder, but only in the sense that the 

 fibrils which compose the axis cylinder are collected into a group 

 from the arborescent processes of the cell ; and thus the fibrils 

 which are seen traversing the substance of the ganglion cell do 

 not originate in the cell, but only undergo a kind of arrangement 

 in it, and then pass to the axis-cylinder process, or extend into 

 the other branched processes. 



The researches of Deiters have rendered it probable that at 

 the origins of the cerebral nerves the groups of ganglion cells 

 which were described by Stilling under the term nerve nuclei, 

 contain ganglion cells which closely resemble those of the an- 

 terior and posterior cornua of the spinal cord, especially in the 

 circumstance that they give off only one peripherically directed 

 axis-cylinder process, the remaining processes breaking up into 

 a ramification of primitive fibrils. 



It is well known that a considerable number of ganglion cells 

 are found distributed through the brain, which do not directly 

 give origin to peripherically coursing fibres ; as, for example, the 

 retort-shaped ganglion cells of the cortex of the cerebellum, 

 and the peculiarly shaped cells of the grey cortical layer of the 

 cerebrum, for the exact description of which we are indebted 

 to the recent investigations of Rudolph Arndt* and Meynert.f 

 In the former, according to Deiters,J the azygous process 

 directed towards the white substance of the cerebellum corre- 

 sponds to the axis-cylinder process ; and it is known that the 

 peripherically coursing processes of these cells branch in an 

 arborescent manner. Other microscopists, as Gerlach, have 

 observed ramifications occur in the centrically directed process. 

 It is therefore scarcely justifiable, in the present state of our 

 knowledge, to institute a precise comparison between these cells 

 and those which are found in the spinal cord. On the other 

 hand, I have myself seen a fibrillar structure in these ganglion 

 cells of the cerebellum and their peripheric processes with the 

 utmost distinctness, as, indeed, had previously been observed 



* Archivfilr Mikroskopische Anatomie, Band iii., p. 441. 

 f Vierteljahrschriftfiir Psychiatric, Bande i. and ii. 

 J Loc. cit., p. 72. 

 Mikroskop. Studien, p. 11. 



