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KMID : 0376219770140010037
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Chonnam Medical Journal
1977 Volume.14 No. 1 p.37 ~ p.43
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Eyeball Responses to Electric Stimulation and Rapid Freezing of Posterior Semicircular Canal Nerves in Rabbits
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Abstract
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In urethane anesthetized rabbits, unilateral posterior semicircular canal nerve was either. s"tiri bated with square-wave pulses or subjected to rapid freezing . and the responses of the eyeball were observed. Eyeball responses to electric stimulation ´of the - posterior semicircular canal nerves were compared to those of rapid t--reezingof the semicircular canals. The experimental results were compared to those of the previous authors obtained in,the same species, and the following -vesuits Were :,obtained:
1. Comparing the observations of the present -author and TUtsumi, bilateral eyeball responses to the anterior and horizontal semicircular -canal nerve stimulation appeared to be similar
2. The ipsilateral eyeball. responses to the posterior semicircular canal nerve stimulation ?were correspondent to Utsunu´s observation;. whereas the contralateral eyeball responses to ,..the posterior semicircular canal. .nerve stimlatioa were contradicto -to those observed by :Utsum
3. Rapid freezing of the unilateral posterior semicircular canal elicited a biphasic (primary and secondary) response in the bilateral eyeballs; the primary response `was inferred ´to ´be one by caloric stimulation (cold stimulation), acid the secondary response´ was inferred to be one by freezing effect.
4. In rapid freezing of the posterior semicircular canal, the eyeball responses were reversed by changing the side of canal; the same was true,. in electric stimulatft.
Assuming that the secondary response of the eyeball of was elicited ting feot of the ie"11 the ;present observation appears to suppas the previous observation-obtained by electric stimulation of the canal in `the same y. species, and these observation" further:: suggests that the results of Utsumi contain experimental errors.
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