前庭眼反射の三次元解析 - 頭位と眼球運動の関係について -
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概要
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Three-dimensional analysis of vestibulo ocular reflexes, using a computerized eye movement analysis system, was carried out in 16 normal human subjects. We examined the relationship between head position and vestibulo-ocular reflexes. The purpose of this study was to clarify the relationship between the functional plane and the anatomical position of the semicircular canals. The subjects were stimulated by pendular rotation with their heads fixed between 40° nose down and 50° nose up in 10° steps with respect to the orbitomeatal line and the lateral canal line. The gain in horizontal eye movement which results from the lateral canal, was the highest at 20° nose down. On the other hand, the gains in vertical and torsional eye movement, which result from the vertical canals, were the lowest at 10° nose up. The phase of vertical and torsional eye movement changed 180° at 10° nose up. These data indicate that the functional plane of the lateral canal almost coincided with the anatomical position. However, at this functional plane of the lateral canal, the influence of vertical canals was not the least. We suggest that this could be the reason why angles formed by the intersection of the lateral canal plane and the vertical canals were not 90°. We could interpret this finding as showing that at the 10° nose up position, the origin of eye movement alternated between the frontal and posterior canals.
- 社団法人 日本耳鼻咽喉科学会の論文
- 1996-12-20