title: Central pain mechanisms.
mesh_terms: D000344:Afferent Pathways / Q000503:physiopathology; D000818:Animals; D001921:Brain / Q000503:physiopathology; D001931:Brain Mapping; D002415:Cats; D004558:Electric Stimulation; D004723:Endorphins / Q000502:physiology; D004745:Enkephalins / Q000037:antagonists & inhibitors / Q000502:physiology; D006801:Humans; D051379:Mice; D009270:Naloxone / Q000494:pharmacology; D009433:Neural Inhibition; D009619:Nociceptors / Q000502:physiology; D010146:Pain / Q000503:physiopathology*; D010148:Intractable Pain / Q000628:therapy; D051381:Rats; D013116:Spinal Cord / Q000503:physiopathology; D013133:Spinothalamic Tracts / Q000503:physiopathology; D013373:Substance P / Q000502:physiology; D013376:Substantia Gelatinosa / Q000503:physiopathology
chemical_list: D004723:Endorphins; D004745:Enkephalins; D013373:Substance P; D009270:Naloxone