A study of the dynamics of the vestibular nystagmus
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概要
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The author studied the dynamics of the isometric and isotonic contractions of the eye-muscles at the vestibular nystagmus, and the following results have been obtained from his experiments.1) At the isotonic contraction of M. rect. ext. and int., the contraction-height was when the load of 15 to 2.8 grams weight was applied. Such a load is named the "Optimal load".2) When more than the optimal load is applied, the contraction-height diminished almost linearly according to the increase of the load, but, to give it in detail, this linear course changed its direction at a certain point which corresponded to a load of 6.8 to 13.8 grams. The quick component however sometimes could not contract over this load.3) The maximal limit of the load, under which the muscle can no longer contract, differs individually in some degree.4) The isometric contractility of the eye-muscle at the vestibular nystagmus is nearly propotional to its extended length, e. g. the skeletal or the heart muscle.5) The theoretical value of the mechanical work of the eye-muscle with the optimal load was 596.585 to 35.878 ergs and that of the slow component is always greater than that of the quick one. The retio of these two is 3.3:1.6) At the vestibular nystagmus, the contraction of ey-muscle is not affected by their antagonists positively nor negatively.7) The author measured the resistance againt the contraction of an eye-muscle, made by the mass and the friçtion of the eye-ball and the resistance of M. retrahens and N. opticus, and obtained the value of ca. 1.6 grams weight.8) Erom this value, the real work of an eye-muscle at the nystagmus can be calculated, and it was 308.90 ergs for maximum, 10.97 for minimum. The ratio of the real work of the slow component to that of the quick component was 3:1.9) The ratio of the theoretical work with the optimal load to the real work was 2:1.10) The maximal limit of the load of the eye-muscle was measured at the nystagmus, which was caused by an exstirpation of a caloric stimulation stimlas of one labyrinth and the following results were obtained:a) At the one side exstirpation of the labyrinth those values of the operated side are greater than those of the non-operated. And at the warm stimulation the value of the affected side is smaller than that of the not affected side, but at the cold stimulation this relation is inverse.b) The value of the slow component is always greater than that of the quick one at any kind of vestibular nystagmus.c) The value of the one side exstirpation of labyrinth is less than that of the cold stimulation, but greater than that of the warm stimulation.
- 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
- A study of the dynamics of the vestibular nystagmus
- A contribution to the knowledge of the slow and quick components in nystagmus by irritation of one labyrinth