title: A reliable, facial nociception device for unrestrained, awake animals: effects of morphine and trigeminal complex lesions.
mesh_terms: D000818:Animals; D001522:Behavior, Animal / Q000187:drug effects / Q000502:physiology; D005145:Face / Q000294:innervation*; D008297:Male; D009020:Morphine / Q000494:pharmacology*; D009619:Nociceptors / Q000187:drug effects / Q000502:physiology*; D011603:Psychophysiology / Q000295:instrumentation*; D051381:Rats; D012867:Skin / Q000294:innervation; D014276:Trigeminal Nerve / Q000502:physiology*
chemical_list: D009020:Morphine