1338 



Physiology. — " Roliuuj nuweuients, and the ascending vestibular ij 

 connections. {Fasciculus Belters Ascendens.) By Dr. L. J. J. 

 MusKENs'). (Communicated by Prof. J. K. A. Wertheim Salo- 

 monson). 



(Communicated in the meeting of April 25, 1913). 



By rolling movements we intend to have understood, the com- 

 plex of symptoms that I described under the name ^) of rolling 

 movements, so that this forced movement was reckoned to be present, 

 as long as the head was rotated around the bodily axis (cervical 

 spine) and there is still presejit an apparent tendency to lie down 

 on one side, and inclination to fall down on that side. We deal 

 here therefore with a locomotion, or tendency to locomotion, in a 

 vertical plane, standing vertical to the long axis of the body. 



I have arranged a great numbei' of experiments, about the N. 

 vestibularis especially on cats, after tlie anatomical lesions, found 

 with the Marchi method after death. 



In a tirst group the cases, where the vestibulary root itself was 

 wounded by the instrument, or was found degenerated at least to 

 such a point (by stretching, cerebral haemorrhage) in such an intensity 

 that a very serious lesion of tiie root either partial or total must 

 have been present. The supposition of this serious lesion of the 

 vestibulary nerve when finding compact degeneration of the root 

 gains in probability, as soon as one compares the duration of the 

 rolling movements in this group with the duration of this movement 

 after other lesions, as also with the duration of the circusmovement 

 in a former publication. ^) Then one is struck by the far longer 

 duration of the forced movements, after direct lesion of the vesti- 

 bulary nerve, i.e. in the cases with anatomically certified degene- 

 ration as above was alluded to. Practically in cats only after direct 

 lesion of the vestibulary nerve during weeks rolling movement can 

 be found; after lesion of the vestibulary nuclei, and a fortiori of 

 the ascending systems only the formerly described minor conditions 

 of the forced mo.vements can be found. • 



If we study up this first group, at once we are struck with the 

 fact, that without exception the rolling movement is performed, in 

 the same direction i.e. in such a way, that the locomotion always 



1) (In this paper, a translation of the one that was con:municated April 25, 1913, 

 ihe author has introduced considerable additions and alterations). 



2) Journal of Pliysiology XXXI, 1904 p. 204—221. 



^) The posterior longitudinal fascicle and the circusmovement. These Procee- 

 ding 26 Oct. 1912, and Neuraxe 1913, p 727. 



