Yonago Acta medica 1999;42:163–166 Location of Thalamic Neurons Mediating Vestibulo-Cortical Pathways in Cats

This study was aimed at examining vestibulo-thalamo-cortical pathways in anesthetized cats. Thirty-six neurons, which were activated by pitch rotation and contralateral laby-rinth stimulation, were recorded in the following areas: the ventral posterolateral nu-cleus, the ventral posteromedial nucleus, the lateroposterior nucleus and the magno-cellular nucleus of the medial geniculate body (MGmc) of the thalamus. Thirteen of these neurons were antidromically activated from the anterior suprasylvian sulcus or postcruciate dimple of the cortex. These results suggest that the ventrobasal complex and MGmc convey inputs from the vestibular apparatus to the vestibular cortex in cats. Key words: anterior suprasylvian sulcus; cat; postcruciate dimple; posterior semicircular canal; thalamus Many studies have revealed the projection of neurons in the vestibular nucleus to the thalamus (Landgren et al., 1967; Sans et al., 1970; Ödkvist et al., 1975). Anatomical studies have shown that thalamic projections to the anterior supra