A contribution to the knowledge of the slow and quick components in nystagmus by irritation of one labyrinth
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The internal and the external rectus muscles isolated from rabbits' eye balls are usd to examine reactions of nystagmus resulted by rotative and caloric irritation on the labyrinth and by extirpation of one labyrinth. Thus from the curve drawn on a myographion we calculated the length of time required of the contraction and the relaxation of the muscle.1) Both slow and quick components in nystagmus resulted by the irritation of one labyrinth are in the phase of the contraction as well as in the phase of the relaxation of the muscle. And they appear complicated each other: i. e. the slow contractive muscle accompanys the quick relaxation and the quick contractive muscle accompanys the slow relaxation.2) The length of time required of one round way of the contraction and the relaxation of the slow contractive muscle and the quick contractive muscle is the same.3) The slow contraction and the relaxation require the same length of time and the quick contraction and the quick relaxation also require the same; this relation does not change according the size of the length of the wave of the curve.4) The proportion of the length of time required of the slow contraction and of the quick contraction is 5:1. And so the same is the proportion between the length of time required of the slow relaxation and the quick relaxation i. e. 5:1.5) Nystagmus does not necessarily need the joint movement of two antagonistic muscles. It can be got perfectly through the irritation of a single eye muscle. In this case the self relaxation of the muscle takes the part of either slow or quick components.6) Therefore the slow component or the slow period so hitherto called means the union of the slow contraction of a slow contrastive muscle and the slow relaxation of quick contractive muscle. So also it must be said in the case of the quick component or the quick period that it is a union of the quick contraction of the quick contractive muscle and the quick relaxation of the slow contractive muscle.
- 耳鼻咽喉科臨床学会の論文
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関連論文
- On the influence of vestibular tonic reflex on Nystagmus of eye caused by exstirpation of a labyrinth of one side
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- A contribution to the knowledge of the slow and quick components in nystagmus by irritation of one labyrinth
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