The extrapyramidal system is a component of the motor system and includes all motor nuclei and motor nerve conduction bundles outside the pyramidal system, the main component being the basal ganglia. Extrapyramidal disorders mainly include: 1) oligomotor tonic disorders (1) Parkinson’s disease (2) Parkinson’s syndrome (3) progressive supranuclear palsy (4) multisystem atrophy 2) increased motor disorders (1) chorea and throwing disorders (2) myoclonus (3) dystonia (4) tic disorders