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KMID : 0376219800170010063
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Chonnam Medical Journal
1980 Volume.17 No. 1 p.63 ~ p.72
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Experimental Studies on Interrelationship Between the Semicircular Canals and Extraocular Oblique Muscles
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Abstract
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In anesthetized rabbits, semicircular canal nerves were excited by electrical stimulation or inhibited by rapid freezing of the canal, and further selectively excited by endolymphatic flow in the canal. Reflex actions of the extraocular oblique muscles were observed in terms of tension and electromyographic activities. The following results were obtained.
1. Electrical stimulation of bilateral semicircular canal nerves elicited reflex rotation of the eyeball which had been cut of all the rectus muscles.
2. Excitation (contraction) of the superior oblique muscle was correlated with the stimulation of ipsilateral canal nerves, and inhibition (relaxation) with that of contralateral ones.
3. Excitation of the inferior oblique muscle was resulted from the stimulation of the contralateral canal nerves, and inhibition from that of ipsilateral ones.
4. Rapid freezing of unilateral canal caused the responses of the oblique muscles which were contradictory to those obtained by stimulation of the same canal nerve.
5. Responses of the oblique muscles to ampullofugal flow in the posterior canal or arnpullopetal flow in the horizontal canal were similar to those obtained by electrical stimulation of each canal nerve.
These results are found to be similar to those obtained by Cohen and his associates made in cats, but partially contradictory to those obtained by Ito et al. in rabbits. Based on these experimental evidences, the present author purpose an axiom which may define functional interrelationship between the semicircular canals and the extra ocular oblique muscles.
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