Medium-lead burst neurons related to vertical saccades in cat Forel's field H: input from vestibular nucleus.
The present study was undertaken to investigate synaptic connections between medium-lead burst neurons (MLBNs) related to vertical saccades in Forel's field H and vestibular nucleus (VN) neurons. Extracellular spikes were recorded from single MLBNs and their responses to VN stimulation were examined using chronically prepared alert cats. Twenty of 30 upward MLBNs and 10 of 22 downward MLBNs could be synaptically activated mainly by the ipsilateral VN stimulation with spike latencies of 2.2-12.0 and 1.9-11.7 ms, respectively. These results suggest that there exist di- or polysynaptic connections which transfer velocity signals for vertical saccades from the ipsilateral vestibular nucleus neurons to the vertical MLBNs.
Shiraishi
Y
Y
Department of Physiology, Faculty of Medicine, Tottori University, Yonago, Japan.
Matsuo
S
S
Nakao
S
S
D000818:Animals; D002415:Cats; D004558:Electric Stimulation; D004567:Electrodes, Implanted; D004585:Electrooculography / Q000187:drug effects; D009415:Nerve Net / Q000166:cytology / Q000502:physiology; D009474:Neurons / Q000502:physiology*; D012438:Saccades / Q000502:physiology*; D013569:Synapses / Q000502:physiology; D014726:Vestibular Nuclei / Q000166:cytology / Q000502:physiology*; D014794:Visual Fields / Q000502:physiology*