The role of periaqueductal grey matter and of spinal serotonergic pathways in morphine analgesia [proceedings].
D002535:Cerebral Aqueduct / Q000187:drug effects* / Q000502:physiology; D009020:Morphine / Q000494:pharmacology*; D009434:Neural Pathways / Q000502:physiology; D012701:Serotonin / Q000502:physiology; D013116:Spinal Cord / Q000502:physiology
D012701:Serotonin; D009020:Morphine