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The Journal of Neurophysiology Vol. 83 No. 5 May 2000, pp. 2891-2904
Copyright ©2000 by the American Physiological Society
1Department of Otolaryngology, Washington University School of Medicine, St. Louis, Missouri 63110; and 2Department of Anatomy, Erasmus University Rotterdam, 3000 DR Rotterdam, The Netherlands
Blazquez, Pablo,
Agis Partsalis,
Nicolaas M. Gerrits, and
Stephen M. Highstein.
Input of Anterior and Posterior Semicircular Canal Interneurons
Encoding Head-Velocity to the Dorsal Y Group of the Vestibular Nuclei. J. Neurophysiol. 83: 2891-2904, 2000. Neurons in the Y group of the vestibular nuclei are activated
disynaptically from the ipsilateral VIIIth nerve and polysynaptically from the contralateral nerve. The ipsilateral anterior and posterior semicircular canals project to the Y group via interneurons in the
vestibular nuclei. Candidate interneurons located in the rostrolateral corner of the superior (SVN) and in the caudal medial (MVN) vestibular nuclei were retrogradely labeled by the iontophoretic injection of
biocytin into the Y group. The physiology of these interneurons named
Y-group projecting neurons (YPNs) was studied in the SVN. SVN-YPNs were
activated antidromically by electric pulse stimulation in the Y group.
The properties of SVN-YPNs are distinct from those of SVN flocculus
projecting neurons (FPNs). Namely, YPNs have a lower resting rate than
FPNs, have more irregular interspike intervals, show a different phase
and gain during the vestibuloocular reflex, and are located
differentially within the SVN. After the injection of biocytin into the
Y group, the locations of Purkinje cells that project to the Y group
were confined to the vertical zones of the flocculus and ventral
paraflocculus. However, mossy fibers originating in the Y group
terminate in both the vertical and horizontal zones of the flocculus
and ventral paraflocculus as well as in the ipsilateral nodulus.
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