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The effects of intravenous morphine on responses of feline thalamic nociceptive neurons receiving afferent input from the tooth pulp (TP) were investigated. Morphine suppressed responses to TP stimulation in both tooth pulp specific (TPS) and wide dynamic range (WDR) neurons with TP input recorded from the nucleus ventralis posteromedialis (VPM). However, there was scant morphine effect on responses to stimulation of trigeminothalamic tract (TTT) fibers in the trigeminal medial lemniscus. Furthermore, in nociceptive neurons with TP input recorded from nucleus centralis lateralis (CL) and parafascicularis (Pf) of the intralaminar nuclei, intravenous morphine suppressed responses both to stimulation of the mesencephalic reticular formation (MRF) as well as TP stimulation. The suppressive action of morphine on responses elicited by TP stimulation of VPM, CL and Pf neurons was antagonized by intravenous naloxone (1 mg/kg). Results suggest that intravenous morphine suppresses synaptic transmission of nociceptive impulses in the intralaminar nuclei as well as in the lower brain stem but not in the VPM.
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