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pp.91-97
Published Date 1951/3/20
DOI https://doi.org/10.11477/mf.1492200466

 FUKUDA Nystagmus is taken as an importantindicator of laoyrinthine function, and it may be evaluated by means of observing the movement of ocular muscles, namely the nystagmus. Labyrinth is excited by alterations of the position of the head or by movements of the body and impulses thus evoked from the labyrinth cause to stir ocular muscles as a pattern of laoyrinthine reflexes. The author considers excitations of labyrinth, not in terms of needless movements of the eyeball, but, as an adjustment of of the eyeball in relation to the position of the head and body that is reflected upon the retinae, which is to say that labyrinth supports visual functions to maintain the equilibrium of the body, both, in static and dynamic states. Therefore, from the point of view of studies on equilibrium, more attentions should be paid to the relationship that exists between the functions of the labyrinth and the eye than they heve been hitherto noted. As labyrinthine nystagmus, similar that of its optic counterpart, is characterized with slow and rapid components, the author states that, the nystagmus is taken as an indicator for the study of relationship between optic and labyrinthine functions in body equilibrium. Evidences which point to this relationship between labyrinthine nystagmus (rotatory and postrotatory) and optic nystagmus are described with experimental proofs. The author concludes that from the weight of evidences that optic reflexes have a tendency to hinder and "cover" labyrinthine nystagmus. This particular fact is remarkably noticeable when testing participants of sports, especially players of various ball games (basketbbll, basetall, tennis, pingpong etc.), in that, post-rotatory nystagmus (Barany) is often entirely obliterated by presence of optic nystagmus. The author asserts that, with function of body equilibrium, the labyrinth belongs to that of fundamental but optic functions are ensconced in those of higher order.


Copyright © 1951, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 印刷版ISSN 0386-9679 医学書院

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