When motor nerves die.
D000203:Activities of Daily Living; D000690:Amyotrophic Lateral Sclerosis / Q000503:physiopathology; D001915:Braces; D006801:Humans; D008124:Locomotion; D009046:Motor Neurons; D009123:Muscle Hypotonia / Q000209:etiology; D009128:Muscle Spasticity; D009468:Neuromuscular Diseases / Q000150:complications / Q000503:physiopathology*; D026741:Physical Therapy Modalities