title: Intracortical inhibition of the motor cortex in movement disorders.
abstract: We have studied the function of inhibitory interneurons within the motor cortex in several movement disorders using a paired-pulse magnetic stimulation technique. Their function was disturbed in patients with dystonia or focal lesions of the basal ganglia. On the other hand, the inhibition was normal in patients with chorea or essential tremor. The inhibitory circuit in the motor cortex must be functionally involved in some movement disorders probably because of changes of the inputs from basal ganglia to motor cortices, but not involved in the others. This difference in the functional involvement of inhibitory interneurons of the motor cortex may reflect different pathogenesis of these movement disorders.
authors.affiliation: Department of Neurology, Division of Neuroscience, Graduate School of Medicine, University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, 113-8655, Tokyo, Japan.
authors.forename: R
authors.initials: R
authors.lastname: Hanajima
authors.forename: Y
authors.initials: Y
authors.lastname: Ugawa
mesh_terms: D000328:Adult; D000368:Aged; D001479:Basal Ganglia / Q000473:pathology / Q000503:physiopathology; D002819:Chorea / Q000473:pathology / Q000503:physiopathology; D005260:Female; D006801:Humans; D007395:Interneurons / Q000378:metabolism / Q000473:pathology; D008280:Magnetics; D008297:Male; D009044:Motor Cortex / Q000473:pathology / Q000503:physiopathology*; D009069:Movement Disorders / Q000473:pathology / Q000503:physiopathology*; D009334:Neck Muscles / Q000503:physiopathology; D009433:Neural Inhibition / Q000502:physiology*; D009434:Neural Pathways / Q000473:pathology / Q000503:physiopathology; D010300:Parkinson Disease / Q000473:pathology / Q000503:physiopathology