内耳性筋反応に関する研究迷路に対する圧刺激

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タイトル別名
  • EXPERIMENTAL STUDIES ON MUSCULAR RESPONSES OF INNER EAR ORIGIN IN RABBITS PRESSURE STIMULATION ON THE LABYRINTH
  • ナイジセイキン ハンノウ ニ カンスル ケンキュウ,メイロ ニ タイスル アツ シゲキ

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Giving compression and aspiration stimuli to the unilateral external meatus, the middle ear and the lateral semicircular canal of rabbits, labyrinthine tonic muscle responses were studied by inducing muscular potential from the surface muscle group (M. trapezius and M. splenius) and the deep muscle group (M. rectos capitis posterior minor et major and M. obliquus capitis superior) of the nape. The results obtained are as follows : I, By a minimal pressure to which a muscular response is available, clinically it develops the eye- and the head- deviation which is produced by only stimuli of the lateral semicircular canal. On electromyogram, the deep muscle group on the side of the non-stimulated ear shows increasing tonic muscle discharge by compressive stimuli, but shows the decrease by aspirative stimuli. The lateral semicircular canal shows more marked tonic muscle response than any other portions., That is, the compressive stimuli increase labyrinthine muscle tonus and facilitat laby- rinthine functions, while the aspirative stimuli decrease the former and inhibit the latter. 2. The tonic muscle responses shown by the EMG of the deep muscle group, appear earlier than ocular nystagmus does. When the nystagmus occcurs, electromyographical muscle responses are marked, but they become irregular being influenced by extra-labyrinthine factors. 3. The tonic muscle responses in the surface muscle group do not seem to be directry related with labyrinthine pressure stimuli, though a further study is required before the assumption is established, 4. The result of pressure stimuli supports the contralateral innervation theory of the musc- ular tonus of inner ear origin in the deep muscle group.

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