68 C. WINKLEK. OF THE CENTRAL COUSRE 



Consequently the atrophy in the corpus trapezoides that might 

 have been expected, was comparable to that, which follows the 

 section of the dorsal root and must have been very slight. 



BAGINSKY who has probably removed completely the contents of 

 the vestibulum , did not intend to withdraw also the ganglion 

 vestibulare. Consequently he found a more important atrophy in 

 the corpus trapezoides, but not so intense as it ought to be after 

 total disparition of the two roots. 



Now this only occurs after the total destruction of the vestibular 

 ganglion , an operation , hardly possible without lesion of the corpus 

 trapezoides itself. 



These being the facts , I believe , that the cases of atrophy of 

 the corpus trapezoides observed months after labyrinth-lesions in 

 young born rabbits will offer very great individual differences. 



Total atrophy never will be found , because powerful secundary 

 systems find a place in the corpus trapezoides. The different modus 

 operandi used by different investigators , will more or less have 

 exposed the vestibular nerve and its ganglion during the operation 

 and makes the lesion more or less equal to a ventral rootsection. 

 In the case that a true rootsection of both roots is made , both , 

 the dorsal as well as the ventral root have completely lost their 

 fibres, and in those circumstances the corpus trapezoides, or better, 

 the systema ventrale nervi octavi, is always atrophied. This atrophy 

 is chiefly confined to its distal part or at least it is rather easily 

 demonstrable there , as the proximal portions of it are enclosing a 

 larger quantity of fibres from secundary systems. 



The figures 3a and 3b , 13 and 13$ on Plate III are repro- 

 ductions of frontal sections through the oblongata of a rabbit , which 

 had lived one year after the removal of the labyrinth combined 

 with section of the VIII th nerve made on the young born animal. 



If the left side (fig. 3a and 13) is compared with the drawings 

 (in fig. 3d and fig. 13$ on Plate III) of sections at comparable 

 levels on the non-operated right side of the same animal , it is 

 immediately seen , that the distal part of the systema ventrale has 

 totally disappeared, not because there might have been a displace- 

 ment of the different parts in the central system, but because the 

 roots are completely atrophied. 



More proximally the systema ventrale reappears and soon it is 

 no longer possible to give a judgment on its atrophy by comparing 

 the two sides. But the atrophy in the distal end of the systema 

 ventrale is not the only fact to be noticed in that case. There also 

 exists a considerable atrophy of the nucleus trapezoides at the oppo- 



