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KMID : 0376219850220010001
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Chonnam Medical Journal
1985 Volume.22 No. 1 p.1 ~ p.8
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Vestibulospinal reflex of the bilateral triceps provoked by semicircular canal action
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Abstract
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This experiment was carried out to explore interrelation between the semicircular canals and fore-limb triceps. Each semicircular canal in rabbits was subjected to electrical stimulation or lymphatic fluid displacement, and then, tension change as well as electromyography responses of the bilateral triceps were recorded.
1. When the reflex response was recorded in the left triceps, electrical stimulation of left posterior canal nerve caused contraction, whereas stimulation of right anterior canal nerve caused relaxation.
2. The left triceps were contracted by stimulation of the left horizontal canal nerve and were relaxed by right horizontal canal nerve.
3. The simultaneous recordings of the refax responses of the bilateral triceps revealed that stimulation of each semicircular canal nerve evoked contraction in the ipsilateral triceps and relaxation in the contralateral ones, and thus the bilateral muscles always reacted in a reciprocal pattern.
4. Ampullofugal lymphatic flow induced in a posterior canal evoked contraction in the ipsilateral triceps and relaxation in the contralateral ones; ampullopetal lymphatic flow in the same posterior canal elicited responses of the triceps in a reversed pattern.
Comparing the above experimental results with those reported by Maeda etal in the cats, the ipsilateral canal effects on the triceps are well dovetailed in the two results, whereas the contralateral canal effects are all contradictory. A diagrammatic model representing interrelation between the semicircular canals and fore-limb triceps is presented.
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