RT Book, Section A1 Ojo, Oluwadamilola A1 Patel, Shnehal A1 Fernandez, Hubert A2 Salardini, Arash A2 Biller, José SR Print(0) ID 1127047073 T1 Movement Disorders T2 The Hospital Neurology Book YR 2016 FD 2016 PB McGraw-Hill Education PP New York, NY SN 9780071845830 LK neurology.mhmedical.com/content.aspx?aid=1127047073 RD 2024/03/29 AB Movement disorders represent a group of neurologic disorders where there is either “too much” movement or hyperkinesias, or “too little” movement or hypokinesias. Some movement disorders combine features of both, such as parkinsonism where there is tremor (a hyperkinetic phenomenon) and rigidity or bradykinesia (both hypokinetic phenomena). While a significant proportion of movement disorders are “extrapyramidal” or resulting from basal ganglia dysfunction, a number of other movement disorders can involve any portion of the neuraxis from the cerebrum to the peripheral nerves. Therefore, movement disorders should no longer be considered synonymous to extrapyramidal or basal ganglia disorders.