Direct projections from the medial vestibular nucleus to the posterior hypothalamic area was found in the macaque monkey by the anterograde and the retrograde tract-tracing methods. After injection of biotinylated dextran amine (BDA) into the ventrolateral part of the medial vestibular nucleus, anterogradely labeled axon terminals were seen bilaterally in the posterior hypothalamic area. After injection of wheat germ agglutinin-conjugated horseradish peroxidase (WGA-HRP) into the posterior hypothalamic area, retrogradely labeled neuronal cell bodies were observed bilaterally in the ventral part of the medial vestibular nucleus with a contralateral predominance.
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