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To address the role of serotonergic projections to the medial vestibular nucleus (MV), whole-cell patchclamp was used to investigate the serotonergic modulation of spontaneous synaptic transmission within the MV of rats.Perfusion of serotonin (5-hydroxytryptamine, 5-HT) to brainstem slices robustly facilitated both spontaneous inhibitory postsynaptic currents (sIPSCs) and spontaneous excitatory postsynaptic currents (sEPSCs) in a subgroup of MV neurons majority of that were categorized as type B MV neurons.