OF THE NERVUS OCTAVUS. 





culus, utriculus and ampullae extracted (whilst, if necessary, the 

 N. octavus has been sectioned at the interior auditory ineatus), - 

 then the one-sided destruction of the peripherical organ of this 

 nerve is followed by tempestuous troubles of motility. 



The eye on that side is jerked violently towards the nasal canthus 

 (laterally) and remains fixed there, turned downward (ventrally) 

 as far as possible. The 

 slit of the eye is ex- 

 ceedingly narrowed , 

 though there is pro- 

 trusio bulbi. 



The opposite eye 

 on the contrary is 

 drawn towards the 

 middorsal line, devia- 

 ting likewise a little 

 in nasal direction , the 

 lateral edge of the 

 sclera becoming visi- 

 ble, the more so be- 

 cause the eye protru- 

 des from the widely 

 opened eye-slit. 



This characteristic 

 position of the eyes, 

 appearing directly af- 

 ter the operation, is 

 maintained at its acme 

 for a few moments 

 only. After a few 

 moments it is some 

 what reduced, and 

 during the reduction 

 often the eyes are 

 continually brought 

 back into their first 

 position by jerks, 

 resembling those of 

 nystagmus. But after some minutes the characteristic position of the 

 eyes, not so intense however as immediately after the operation, 

 has become permanent and continues for weeks, months or some- 

 times even years after the operation with small loss of intensity. 



2* 



Fig. 7. 



Position of the eyes in a rabbit. 

 Three weeks after the removal of the left labyrinth . 



