164 C. WINKLER. THE CENTKAL COUKSK 



descends in the lateral fillet , medial from the ventral spino-cere- 

 bellar ascending tract, to the lateral part of the corpus juxta- 

 restiforme , and having endings between the cells found there. 



Here is another sensu-motor way, not so very important in regard 

 to octavus-impulses , but very important in regard to the congenial 

 kinaesthetic impulses, relying fibres from the two medial nuclei 

 tecti with the corpus juxta-restiforme and the nucleus of DEITERS. 

 And at the same time we have seen a small quantity of fibres 

 mostly secundary , descend homolaterally into another known way 

 towards the horn of the spinal cord , in the so called rubro-spinal 

 tract. Here is another sensu-motor way, not very important, I 

 think, in regard to octavus-impulses, but touching to systems 

 issued from the red nucleus, whose relation to optic impulses is 

 probable, but as yet, insufficiently known. 



Resulting from the details given in the second chapter , there 

 are demonstrated in rabbits important, mostly secundary, but to 

 a slight degree primary systems, forming connecting links between 

 the end-organs of the N. octavus and different homolateral motor 

 nuclei. The most important of them are the two first mentioned systems. 

 They connect the labyrinth-nerves to both nuclei of the N. abdu- 

 cens (ramus descendens N. octavi, fasciculus longitudinalis posterior 

 and transverse rootfibres) , to the homolateral trochlear-nucleus and 

 the distal oculomotor-nucleus (tract us DEITERS ascendens, fasciculus 

 longitudinalis posterior) , to the homolateral motor nuclei in the 

 medulla oblongata, to the cervical motor horn of the medulla spinalis 

 and even to the thoraco-lumbal part of it (tractus DEITEKS descen- 

 dens, fasciculus praedorsalis and tractus rubro-spinalis). 



In this way it may be understood, why after one-sided removal 

 of the labyrinth or after rootsection, in rabbits motor disorders of 

 the eyes appear, different on both eyes. 



The homolateral eye misses the usual innervations of the N. 

 abducens, N. trochlearis and a part of the N. oculomotorius. If 

 this loss be complete, a forced position is seen towards the inner 

 canthus and downward, if incomplete, jerks of nystagmus tend to 

 produce this forced position. The influence of the remaining im- 

 pulses upon the proximal motor eye-nuclei is sufficient to explain 

 this position. 



The contralateral eye only misses the usual inner vation of its N. 

 abducens. Under the influence of the remaining impulses it is turned 

 laterally or dorsal ward (pag. 19). 



And in the same way it may 'be understood, why rabbits having 

 lost a preponderant innervation of the cervical motor spinal cord, 



