小脳片葉へ投射する脳幹の起始核

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  • Origin of the projections to the cerebellar flocculus from the brainstem

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Horseradish peroxidase (HRP) was iontophoresed neurons were recognized in the lateral reticular nucleus (of the side ipsilateral to the injection site), dorsal cap of the inferior olive (contralateral), inferior central nucleus of the raphe (bilateral), superior central nucleus of the raphe (bilateral), caudal part of the dorsal nucleus of the raphe (bilateral), vestibualr nuclei (bilateral), and nucleus reticularis tegmenti pontis (bilateral).<BR>Electrical stimulation of the caudal part of the dorsal nucleus of the raphe (DNR) elicited orthodromic-evoked potentials with a latency of 2-2.6 msce in the cerebellar flocculus and the positions of stimulating electrode where the threshold current was lower than 150μA were limited to a small area corresponidng well with the caudal part of the DNR.<BR>Electrical stimulation of the cerebellar flocculus elicited antidromic unitary responses with the latency of 1.2-1.3msec in the caudal part of the DNR. The latency and the synaptic delay in the flocculus corresponded well with that of the orthodromic evoked potentails.<BR>These findings of the present study strongly suggest that there exists floccular afferent projections from the caudal part of the DNR.

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