RT Book, Section A1 Ropper, Allan H. A1 Samuels, Martin A. A1 Klein, Joshua P. A1 Prasad, Sashank SR Print(0) ID 1199440798 T1 Disorders of Movement and Posture T2 Adams and Victor's Principles of Neurology, 12e YR 2023 FD 2023 PB McGraw-Hill Education PP New York, NY SN 9781264264520 LK neurology.mhmedical.com/content.aspx?aid=1199440798 RD 2024/11/10 AB In this chapter, disorders of the automatic, static, postural, and other less voluntary motor activities of the nervous system are discussed. Many of them are an expression of what has come to be called the extrapyramidal motor system, meaning—according to S. A. K. Wilson, who introduced this term—the motor structures of the basal ganglia and certain related thalamic and brainstem nuclei. However, others such as myoclonus and various tremors have obscure or multiple causes. These are discussed together because they are often combined and because of their inclusion in the neurological subspecialty of movement disorders.