RESPONSES OF SINGLE NEURONS OF THE VESTIBULAR NUCLEI TO LATERAL TILT AND CALORIC STIMULATION IN CATS

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概要

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• The response of unitary discharges of the vestibular nuclei to caloric stimulation and lateral tilt was studied in the encephale isolé preparation of unanesthetized and pentobarbital anesthetized cats. The mean frequency of the spontaneous discharges in the vestibular nuclei was significantly higher in the unanesthetized cats than in the pentobarbital anesthetized ones. The responses of 32 vestibular neurons to both cold and warm stimulation in the pentobarbital anesthetized animals were classified into the following three types: the increased, in which the frequency of the unitary discharges was increased by both caloric stimulations, the decreased, in which the frequency was decreased by both caloric stimulations and the refractory in which the frequency did not change with either caloric stimulation. In the unanesthetized animals, the response of 232 vestibular neurons was classified into the following five types, increased, decreased, reversed type-I in which the frequency of the unitary discharges was decreased by cold stimulation and increased by warm stimulation, reversed type-II in which the frequency was increased by cold stimulation and decreased by warm stimulation, and the refractory type. The reversed type of the vestibular neurons was observed only in the unanesthetized animals. Responses of the lateral tilt of 93 vestibular neurons were classified into 5 types; increased, decreased, reversed type-I (increase in the unitary discharge rate with ipsilateral and decrease with contralateral tilt), reversed type-II (decrease with ipsilateral and increase with contralateral tilt), and refractory type. The decreased type of neuron was the predominant pattern in the responses of the lateral tilt (60.2%).<BR>Two main types of neurons were localized in the vestibular nuclei: those increasing the frequency in response to ipsilateral tilt selectively, and the other increaseing the frequency in response to caloric stimulation with cold water.

• 日本めまい平衡医学会の論文

著者

• MORIMOTO Masanori

  From the Department of Otorhinolaryngology, School of Medicine University of Kyoto, Kyoto Supported in part by a grant from the Takeda Science Foundation

• MATSUOKA Izuru

  From the Department of Otorhinolaryngology, School of Medicine University of Kyoto, Kyoto Supported in part by a grant from the Takeda Science Foundation

関連論文

• RESPONSES OF SINGLE NEURONS OF THE VESTIBULAR NUCLEI TO LATERAL TILT AND CALORIC STIMULATION IN CATS

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