title: Onion bulb formations in chronic polyneuropathies.
mesh_terms: D000200:Action Potentials; D003711:Demyelinating Diseases; D006801:Humans; D008475:Median Nerve / Q000503:physiopathology; D008854:Microscopy, Electron; D009410:Nerve Degeneration; D009431:Neural Conduction; D010525:Peripheral Nerves / Q000473:pathology*; D010523:Peripheral Nervous System Diseases / Q000473:pathology* / Q000503:physiopathology; D012583:Schwann Cells; D013497:Sural Nerve / Q000473:pathology; D014459:Ulnar Nerve / Q000503:physiopathology