Acute morphine induces oscillatory discharge of noradrenergic locus coeruleus neurons in the waking monkey.

Abstract

Neurons were recorded extracellularly from the locus coeruleus (LC) of a waking, chair-restrained cynomolgus monkey before and for 0.5-4 h after intramuscular injections of morphine sulfate (0.3-10 mg/kg). Tonic discharge of each LC neuron tested (n = 11) decreased after morphine injection; this effect appeared to be dose-dependent for the range of 0.3-3.0… (More)

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