前庭核破壊による眼振の観察

抄録

The vestibular nuclei play an important role in the vestibular nystagmus, but many obscure problems have been remaind about them.
The author carried out the- experiment with rabbits, and observed the influence of higher center (temporal area, paraflocculus) to the nystagmus induced by destruction of vestibular nuclei.
Spontaneous nystagmus and directional preponderance (D. P.). were carefully obserued during tha exteriuent.
D. P. was determined by alternative hot and cold test.
The localization of the injury was confirmed by histological examination.
The results obtained were summarised as follow:
1) In case of horizontal nystagmus after destruction of vestibular nuclear area, the injuries were seen chiefly in Deiter's nuclei and lateral part of medial longitudinal fasciculus. It was estimated that they were connected with horizontal nystagmus but it was difficult to find the constant relation between the other types of nystagmus and vestibular nuclei.
2) There are three types-of D. P. when the spontaneous nystagmus disappeared after desfruction of vestibular nuclei, D. P. to the operated side, D. P. to the non-operated side and thesec no D. P.
3) Although the cases showing D. P. to the operated side were never influenced by injury of temporal area, but they were influenced by injury of paraflocculus.
4) D. P. to the operated side observed after destruction of vestibular nuclei were more easily influenced by the central lesion than D. P. to the nonoperated side.
5) In regarding to inhibition of higher center to the vestibular nuclei, paraflocculus acted much stronger than temporal area.