Plane-specific brainstem commissural inhibition in frog second-order semicircular canal neurons

Experimental Brain Research
S Holler, H Straka

Abstract

Commissural inputs of identified second-order semicircular canal neurons were studied by separate stimulation of each of the three canal nerves on either side in the vitro frog brains. The spatial pattern of these inputs was further investigated in those second-order canal neurons that received a monosynaptic input from only one ipsilateral canal nerve (91%). Since similar results were obtained in the presence as in the absence of the cerebellum, commissural inputs must have been relayed via fibers crossing in the brainstem. Following stimulation of individual semicircular canal nerves, commissural inputs were either inhibitory or excitatory. A commissural inhibition was evoked in the majority of the recorded neurons (79%) by stimulation of the coplanar semicircular canal nerve on the contralateral side. In the remaining neurons, a commissural excitatory input was evoked. A commissural excitation, originating from the two noncoplanar semicircular canals, predominated in most (68%) of the recorded neurons and was independent of the type of second-order canal neuron. The onset latency of the canal plane-specific commissural inhibitory potentials was di- or trisynaptic. Stimulation of the contralateral VIIIth nerve evoked excitato...Continue Reading

Citations

Jul 31, 2001·The Journal of Comparative Neurology·H StrakaE Gilland
Dec 2, 2005·The Journal of Comparative Neurology·Hans StrakaEdwin Gilland
May 27, 2006·Brain Research·Michael S Jones, Michael Ariel
Jul 11, 2003·Journal of Neurophysiology·Hans StrakaEdwin Gilland
Jun 21, 2018·Frontiers in Neurology·Francisco Branoner, Hans Straka
Nov 24, 2016·Frontiers in Neural Circuits·Francisco BranonerHans Straka

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