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KMID : 0376219810180020257
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Chonnam Medical Journal
1981 Volume.18 No. 2 p.257 ~ p.264
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Responses of the Splenius Capitis Muscle to Excitation of Vestibular Canal Nerve in Rabbits
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Abstract
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This experiment was carried out to explore functional interrelationship between the vestibular canals and the neck extensor muscles, which are the receptor and effector organs involved in vestibulocollic reflex. In urethane anesthetized rabbits, the semicircular canal nerves were selectively stimulated with square wave pulses, and changes in isometric tension as well as electromyographic activity of the splenius capitis muscles were recorded by means of a polygraphic recorder. The following results were obtained.
1. Excitation of a unilateral posterior canal nerve elicited antagonistic changes in EMG activities of the bilateral splenius capitis muscles: an increased activity in the ipsilateral muscle while the contralateral showed a decrease.
2. Separate excitation of individual canal nerve caused the relaxation of the ipsilateral splenius muscle and the contraction of the contralateral one.
3. Electromyographic activity of the splenius muscle under the stimulation of the unilateral canal nerve, altered to a reverse direction, whenever excita-tion of the contralateral canal nerve was overlapped.
Based on the above observations a schematic diagram was presented, which can best illustrate the functional interrelationship between the bilateral vestibular canals and the extensor muscles of the neck. This scheme is at variance with the one proposed by Wilson and his associates for cats. Various possibilities to account for the discrepancy were discussed.
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