Abstract
Publisher Summary Intracellular recording was made from the abducens motoneurons during vestibular nystagmus in encephale isole cats under local anesthesia. Nystagmus was induced by high frequency electric stimulation of the vestibular nerve on each side. Rhythmic changes in both the inhibitory postsynaptic potential (IPSP) and the excitatory postsynaptic potential (EPSP) in the motoneuron underlie the membrane potential rhythm during vestibular nystagmus. The membrane potential rhythms in the antagonistic pair of motoneurons exhibit an approximately symmetric configuration, a slow depolarization in the agonistic motoneuron and a slow hyperpolarization in the antagonist, which are followed by a quick hyperpolarization in the former and a quick depolarization in the latter. The onset of quick hyperpolarization in the agonistic motoneuron is highly synchronous with the onset of quick depolarization in the antagonistic motoneuron. The asynchronism of impulse initiation and suppression in the antagonistic pair of motor nerves at the quick phase is formed at the level of the motoneuron but not in the path towards the motoneuron. Discharge pattern of axons of the secondary vestibular neurons recorded within the abducens nucleus is closely correlated to the postsynaptic motor activities not only at the slow phase but also at the quick phase.
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