518 THE BRAIN OF MAMMALS, BY TH. MEYNERT. 



cerebellum is still in a very imperfect and fragmentary state. 

 Stilling, in the part referring to it in his great work, has not 

 entered into its description beyond giving an account of the 

 uvula and of the central lobule. We must undoubtedly admit 

 the existence of medullary systems in the cerebellum, which 

 arise and terminate in this centre, and, as fibrce proprice, con- 

 trast with the peduncles, which run out and are prolonged 

 into certain parts of the trunk. 



1. Fibrce proprice. Burdach, Arnold, and, from the exami- 

 nation of sections, Stilling, have described the common fibres 

 proprise as garland-like fasciculi (arranged in delicate lamellae) 

 extending along the inner surface of the cortex, from con- 

 volution to convolution. Stilling also describes still more 

 extensive systems of special fbrce proprice, which serve to 

 connect more remote portions of the cerebellar cortex with 

 each other. His description includes that of the symmetrical 

 pairs of fasciculi belonging to this system, running near the 

 middle line, to which he has applied the term median fasciculi. 

 An anterior division of the same runs symmetrically on either 

 side, from the most anterior portions of the superior vermiform 

 process, straight beneath the roof-nucleus to the lobules of the 

 inferior vermiform process ; that is to say, from the uvula 

 to the nodulus. Another and also symmetrical division, con- 

 sisting of stronger median fasciculi, encloses the former con- 

 centrically, and runs, forming an arch directed in the first 

 instance with its convexity towards the superior vermiform 

 process, but subsequently backwards, which extends from the 

 most anterior convolutions of the superior vermiform process 

 to the most remote, that is to say, to the most anterior, convo- 

 lutions of the inferior vermiform process. Moreover, a variously 

 developed proportion of transverse commissural fasciculi is 

 found in the cerebellum, which, crossing the middle line, con- 

 nect corresponding opposite and symmetrical regions of the 

 cerebellum, exactly in the same manner as is effected in the 

 cerebrum by the trabecular system of the corpus callosum. 



2. The arms or brachia of the cerebellum. Of the brachia 

 of the cerebellum the processus ad pontem and a great part 

 at least of the restiform body take a simple course. The 

 points of decussation of their fasciculi, as has been already 



