title: Peridural morphine analgesia is mediated by a direct spinal effect.
mesh_terms: D000767:Anesthesia, Epidural; D006801:Humans; D009020:Morphine; D010146:Pain / Q000503:physiopathology*; D012018:Reflex / Q000502:physiology*; D013116:Spinal Cord / Q000503:physiopathology*
chemical_list: D009020:Morphine