Abstract
Publisher Summary This chapter discusses the stimulation of VIII nerve evokes inhibitory postsynaptic potentials (IPSPs) or excitatory postsynaptic potentials (EPSPs) disynaptically in III and IV nuclei neurons of rabbits. By systematically tracking through the medulla, the locations of vestibuloocular relay neurons have been determined. Inhibitory relay cells are concentrated in the superior vestibular nucleus, while excitatory relay cells are contained in the rostra1 2/3 of the medial vestibular nucleus, in the lateral cerebellar nucleus and probably in the group y of the vestibular nuclear complex. These inhibitory and excitatory projections to each subgroup of III and IV nuclei innervating different extra-ocular muscles were determined by identifying oculomotor neurons antidromically with separate stimulation of nerve branches in the orbit. It is thus indicated that inhibition from the superior nucleus is exerted ipsilaterally upon all subgroups of III and IV nuclei except for bilateral action upon medial rectus motoneurons. Excitation from the medial nucleus is on the other hand exerted contralaterally except for bilateral innervation of medial rectus neurons.
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