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KMID : 0376219760130010087
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Chonnam Medical Journal
1976 Volume.13 No. 1 p.87 ~ p.91
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Mode of interaction of semicircular canals on the superior and inferior rectus muscles
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Abstract
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In urethane anesthetized rabbits, two semicircular canal nerves were selected in various combinations and were subjected to square wave stimuli to elicit vestibular afferent impulses, and the extraocular muscle responses were recorded to observe the mode of interaction between the two different vestibular canals. The experimental results were as follows.
1. Tension of the superior rectus muscle was increased by the separate or simultaneous stimulation of the ipsilateral anterior and posterior canal nerves; the tension produced by the simultaneous stimulation of the both canal nerves was greater than that produced by the separate stimulation of the individual canal nerve, and was lesser than the sum of the each tension produced by the separate stimulation.
2. Tension of the inferior rectus muscle was increased by the stimulation of the contralateral anterior canal nerve and was decreased by the ipsilateral posterior canal nerve. Tension change produced by simultaneous stimulation of the two canal nerves was not correspondent to the algebraic sum of the responses obtained by separate stimulation of individual canal nerve. When the stimulation of inhibitory canal nerve was overlapped to the stimulation of excitatory canal nerve, the response was almost correspondent to that produced by the simultaneous stimulation.
These experimental results suggest that the afferent impulses from the different vestibular canals converge into the ocular motor nuclei and interact to produce summation-effect on the tension of oculorotatory muscle.
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