title: The concept of nervous system levels.
mesh_terms: D000818:Animals; D001927:Brain Diseases / Q000175:diagnosis; D001931:Brain Mapping; D002490:Central Nervous System / Q000196:embryology / Q000502:physiology* / Q000503:physiopathology; D002540:Cerebral Cortex; D003214:Conditioning, Classical / Q000502:physiology; D006801:Humans; D008607:Intellectual Disability / Q000503:physiopathology; D001523:Mental Disorders / Q000503:physiopathology; D008606:Mental Processes / Q000502:physiology; D009430:Neural Analyzers / Q000502:physiology; D010802:Phylogeny; D011613:Psychotherapy; D013119:Spinal Cord Injuries / Q000175:diagnosis