Abstract
The vestibulothalamic connections were studied in the rat using wheat germ agglutinin-horseradish peroxidase (WGA-HRP). The distributions of anterograde labelling of fibers and terminals in the brainstem and the thalamus were analyzed by injecting WGA-HRP into the superior (SVN) and lateral (LVN) vestibular nuclei, and the medial (MVN) and inferior (IVN) vestibular nuclei. The distributions of retrograde labelling of cells were analyzed in the vestibular nuclear complex by injecting WGA-HRP into the thalamus centered in the central lateral nucleus (CL), ventral posterolateral nucleus (VPL), and rostral part of the dorsal medial geniculate nucleus (rMGd). The vestibular projection to the CL via the medial longitudinal fasciculus (MLF) and the ascending tract of Deiters (ATD) originates mainly in the contralateral MVN and ipsilateral SVN. The vestibular projections to the VPL and the ventral lateral nucleus (VL) via MLF, ATD and superior cerebellar peduncle (SCP) originate mainly in the MVN and SVN, bilaterally. The projection to the rMGd via the lateral lemniscus-inferior collicular brachium, and MLF (and SCP) originates in the contralateral IVN.
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