Projections of the group y of the vestibular nuclei and the dentate and fastigial nuclei of the cerebellum to the interstitial nucleus of Cajal.


:Experiments were performed to study the projection of the group y of the vestibular nuclei and the dentate and fastigial nuclei of the cerebellum to the interstitial nucleus of Cajal (INC) in cats by using retrograde axonal transport of horseradish peroxidase (HRP) and electrophysiological methods; and to study the vestibular responses of such projection neurons. Following injections of HRP into the unilateral INC, with partial involvement of the surrounding reticular formation, including the nucleus of Darkschewitsch (ND), many retrogradely labeled neurons were found in the dorsal part of the group y nucleus contralateral to the injection site. Labeled cells were also seen in the contralateral dentate nucleus, frequently in its caudal-ventral part, and in the contralateral fastigial nucleus at all rostrocaudal levels, but most frequently in its caudal part. In electrophysiological experiments performed on cats anesthetized with alpha-chloralose or N2O and paralyzed with gallamine, group y, dentate and fastigial nuclei neurons were antidromically activated by weak stimuli that were confined to the contralateral INC. Depth-threshold curves for antidromic activation of such neurons revealed that the lowest threshold points were within the INC, but not in the ND. The INC-projecting neurons in the group y and dentate nuclei did not respond to electrical stimulation of the ipsilateral or contralateral vestibular nerve, indicating that they do not receive direct labyrinthine inputs. On the contrary, many fastigial neurons projecting to the INC responded to labyrinthine stimulation, suggesting that they may be involved in the vestibular reflexes. These results suggest a difference in properties of INC-projecting neurons in these nuclei.


Neurosci Res


Neuroscience research


Fukushima K,Terashima T,Kudo J,Inoue Y,Kato M




Has Abstract


1986-05-01 00:00:00














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