Diseases of the human nervous system underlie a large number of symptoms of disorders, ranging from the smallest disturbances of personality through such major problems as crippling, blindness, violent behaviour and even death. Diseases of the nervous system may be divided into the following types: Neurological manifestations secondary to other diseases, neurochemical disorders, developmental defects, diseases of peripheral nerves, diseases of the spinal cord, diseases of the autonomic nervous system, diseases of the brainstem and cranial nerves, motor system disorders, diseases of the cerebellum, intracranial tumours, diseases of the cerebrum, infections of the nervous system, demyelinating disorders, craniocerebral trauma, epilepsy, toxic poisoning, neuromuscular disorders.