title: Thalamocortical modulation of pain: comparative effects of intravenous morphine and electrical stimulation of periaqueductal gray.
mesh_terms: D000818:Animals; D001921:Brain / Q000503:physiopathology*; D001931:Brain Mapping; D002415:Cats; D004558:Electric Stimulation; D005260:Female; D010146:Pain / Q000503:physiopathology*; D011957:Receptors, Opioid / Q000502:physiology*
chemical_list: D011957:Receptors, Opioid