Eye movements evoked by selective saccular nerve stimulation in cats

Objective: Because of technical obstacles in controlling current spread to adjacent peripheral nerve, eye movements evoked by activation of the otolith organs have not been investigated in detail compared to eye movements evoked by activation of the canal organs. We attempted to solve this problem b...

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Bibliographic Details
Published in:Auris, nasus, larynx nasus, larynx, 2004-09, Vol.31 (3), p.220-225
Main Authors: Goto, Fumiyuki, Meng, Hui, Bai, Rishu, Sato, Hitoshi, Imagawa, Midori, Sasaki, Mitsuyoshi, Uchino, Yoshio
Format: Article
Language:English
Subjects:
Animals
Cats
Cranial Nerves - physiology
Electric Stimulation - instrumentation
Electrical stimulation
Electromyography - instrumentation
Electrooculography - instrumentation
EOG
Eye movement
Neck Muscles - innervation
Physiology
Saccades - physiology
Saccule and Utricle - innervation
Sacculus
Videotape Recording
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Summary:Objective: Because of technical obstacles in controlling current spread to adjacent peripheral nerve, eye movements evoked by activation of the otolith organs have not been investigated in detail compared to eye movements evoked by activation of the canal organs. We attempted to solve this problem by applying more sensitive methods using fine needle and strictly controlling stimulus current intensity compare with filed potential for selective stimulation. Methods: Eye movements evoked by selective, unilateral saccular (SAC) nerve stimulation were investigated using both electrooculography (EOG) and video recording in decerebrated cats in the presence or absence of anesthesia. Electrical stimulation was applied to the SAC nerve through implanted acupuncture needles. Results: In the absence of anesthesia and with stimulus intensities less than (3.1±2.7)×N 1T, we found supraduction in both eyes or in either the ipsilateral or contralateral eye of different cats. We observed downward eye movements using a stronger stimulus intensity ((6.2±2.9)×N 1T). The threshold for downward eye movements was significantly greater than that for upward eye movements ( P
ISSN:0385-8146
1879-1476
DOI:10.1016/j.anl.2004.03.002