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KMID : 0608619960060040072
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Korean Journal of Aerospace and Environmental Medicine
1996 Volume.6 No. 4 p.72 ~ p.83
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Reflex Actions of the Vertical Semicircular Canals on the Extraocular Vertical Rectus and Biventer Cervicis Muscles in Cats
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박종성
임성희/정한성/박사훈
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Abstract
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The electromyographic responses of the extraocular vertical rectus and cervical biventer cervicis muscles to stimulation of the vertical (superior or inferior) semicircular canal nerves were observed to explore the functional relationship between
the
canals and the muscles.
1. The extraocular superior rectus muscle was inhibited by stimulation of the ipsilateral superior canal nerve and excited by stimulation of the contralateral superior canal nerve. And the muscle revealed same pattern response to stimulation of
the
inferior canal nerve.
2. The extraocular inferior rectus muscle was inhibited by stimulation of the ipsilateral vertical (superior or inferior) canal nerves, whereas the responses of the same muscle were reversed by stimulation of the contralateral vertical canal
nerves.
3. The cervical biventer cervicis was inhibited by stimulation of the ipsilateral vertical canal nerves and excited by stimulation of the contralateral canal nerves.
4. When the biventer cervicis was inhibited to prolonged stimulation of the ipsilateral inferior canal nerve, brief superimposed stimulation of the contralateral inferior canal nerve reversed the inhibited response.
5. Superimposed stimulation of the contralateral inferior canal nerve reversed the electromyographic response of the superior muscle induced by stimulation of the ipsilateral inferior canal nerve.
Thus, the superior rectus and cervical biventer cervicis muscles produced opposite pattern responses to the vertical canal nerve stimulation, But responses of the biventer cervicis and extraocular inferior rectus muscles to the canal nerve
stimulation
were found out to be consistent. The excitatory neural pathways from the vestibular nucleus to the cervical and extraocular superior and inferior rectus muscle motoneurons are crossed to the opposite side, whereas the inhibitory pathways from the
nucleus to the muscle motoneurons are not crossed.
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