«27 



Of the sensory and sensorial stimuli wliieii reach the cerebellum 

 along centripetally conducting paths and which are well-known lo 

 us, we may mention in the first place the functions of the deep 

 sensation and of the sense for the muscle tone and the equilibrium. 



The tirst pass with the posterior nerve-roots into spinal cord and 

 run partially uncrossed, with the Column of Clark as mid-station, to 

 the tractus spino-cerebellaiis dorsalis (Fovilt.k-Flechsig), while another 

 part, with the area nuclei intermedii as mid-station, run also for 

 more than the greater part uncrossed to the tractus spino-cerebel- 

 laris ventralis (Gower), while a smaller part goes to the same coin nui 

 of the crossed side. This bundle is therefore partially com|)Osed of 

 crossed, partially of uncrossed fibres. 



The tracts of Flechsig and GovyER lie in a long but narrow strip 

 at the lateral edge of the spinal cord and run centripetally. 



The tract of Ft.kchsig goes through the restiforme body and the 

 inferior brachium conjunctivum towards the vermis of the cerebel- 

 lum, without coming in contact with the dentate nucleus. 



The ti'act of Gower does not pass into the restiforme body after 

 having reached the medulla oblongata, but runs on in longitudinal 

 direction. On the level of the nervus trigeminus it bends round in 

 latero-dorsal direction ajid passes along the brachium conjunctivum 

 cerebelli into the vermis superior and the nuclei tecti cerebelli. 



From tlie posterior colunms of the spinal cord however, there 

 are along other paths also tracts connected with the cerebellum, e.g., 

 through the nuclei of Goll and Burdach, along the fibrae arcuatae 

 externae and anteriores to the restiforme body and fiom here to 

 the cerebellum. 



As the influence of these latter fibres is far from known, I will 

 leave them in the further discussion out of the question. 



Now the experiments of Marburg and Bing ^) have taught, that 

 the lesion of the spino-cerebellar tracts provokes a very serious 

 disturbance of the statotonus. Partial or total destruction of these 

 bundles from the entrance 'in the spinal-cord to the cerebellum, will 

 therefore show disturbance of the equilibrium. 



If the connection between the tracts of Flechsig and Gower with 

 the cerebellum are well-known, this is less the case with those 

 between the vestibular organ and the cerebellum. 



Langelaan ') writes that the end-arborisation in the oblongata of 



1) Edinger. Zeitschr. f. Nerv. Heilk. V. 45, 1912 p. 303. 



') 1. W. Langelaan. Boinv van het centrale zenuwstelsel. Amsterdam. Versluys. 

 1910. 



41* 



