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KMID : 0376219830200010215
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Chonnam Medical Journal
1983 Volume.20 No. 1 p.215 ~ p.222
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Reflex Response of Brachial Extensor Muscle to Semicircular Canal Excitation
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Abstract
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This experiment was carried out to explore functional interrelation between the semicircular canals of the vestibular apparatus and the brachial extensor muscles of the forelimbs in rabbits. The semicircular ampullary nerves were electrically stimulated in various combination with the monopolar electrode placed closely to the nerve endings, and an electromyographic response of the triceps brachii of the ipsilateral or contralateral forelimb was recorded. In some instances, response of an extraocular muscle was also recorded simultaneously for comparison. The results were as follows.
1) An electromyographic activity of the triceps brachii was increased by excitation of the ipsilateral anterior canal (ampullary) nerve, and decreased by the contralateral canal nerve.
2) Similarly, the muscle activity was increased upon excitation of the ipsilateral horizontal canal nerve, and decreased upon the contralateral canal nerve.
3) Simultaneous excitation of two vertical or all canal nerves of the ipsilateral side increased the muscle activity, whereas that of contralateral canal nerves decreased or abolished the muscle activity.
Among the experimental results above, the muscle response to contralateral canal excitation reveals to be contrary. to the previous observation made on the extensor motor neurons in cats by Wilson and his associates. Based on the reciprocal response pattern elicited by excitation of the bilateral canal nerves, a simple axiom is proposed; the brachial extensor muscle contracts in response to excitation of the ipsilateral semicircular canals and relaxes in response to the contralateral canals.
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