title: Site of action of intrathecal morphine.
mesh_terms: D006801:Humans; D007278:Injections, Spinal; D009020:Morphine / Q000378:metabolism / Q000494:pharmacology*; D011957:Receptors, Opioid / Q000378:metabolism*; D013116:Spinal Cord / Q000187:drug effects*
chemical_list: D011957:Receptors, Opioid; D009020:Morphine