Meaning of extrapyramidal system

extrapyram'idal sys"tem

Pronunciation: [key]
— Anat. Anat.
  1. the part of the central nervous system, including the descending motor fibers other than those of the pyramidal tract, that regulates muscle tone, posture, and other aspects of body movement.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.