On the central sites for the antinociceptive action of morphine and fentanyl.

Animals Behavior, Animal/drug effects Binding Sites Carbon Isotopes Cerebral Ventricles/drug effects Dental Pulp/physiology Diencephalon/drug effects Electric Stimulation Female Fentanyl/pharmacology Injections, Intravenous Injections, Spinal Male Mesencephalon/drug effects Morphine/pharmacology Pain Rabbits Reflex/drug effects

Carbon Isotopes Morphine Fentanyl