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KMID : 0376219930300020213
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Chonnam Medical Journal
1993 Volume.30 No. 2 p.213 ~ p.226
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Functional connections between the anterior semicircular canal and the extraocular muscles in cats
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Abstract
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In Urethane anesthetized cats, the unilateral anterior semicircular canal nerve was selectively stimulated with square-wave pulses, and the reflex responses of the bilateral extraocular (horizontal, vertical rectus and oblique) muscles were
recorded by
means of plain and integrated electromyography.
The superior and medial rectus muscles were excited and the inferior and lateral rectus muscles were inhibited in the ipsilateral eye, and responses of the same muscles were reversed in the contralateral eye. In the ipsilateral eye the superior
oblique
muscle was excited and the inferior oblique muscle was inhibited, and responses of the two muscles were reversed in the contralateral eye.
Based on these results, it was possible to draw a schematic diagram of the reflex pathways from the anterior canal to the bilateral extraocular muscles. The diagram revealed an axiom; pathways to the ipsilateral superomedial and the contralateral
inferolateral muscles are excitatory, whereas those to the ipsilateral inferolateral and the contralateral superomedial muscles are inhibitory.
Considerable discrepancies were found between the authors' diagram and that presented by Highstein and McCrea, which showed no such an axiomatic rule.
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