motor cortex

the region of the cerebral cortex concerned with transmitting impulses to the voluntary muscles.

1885–90 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Medical Dictionary

motor cortex n.
The region of the cerebral cortex influencing movements of the face, neck and trunk, and arm and leg. Also called excitable area, motor area, Rolando's area.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
But in the long term the ultimate goal would be to place electrodes in the
  motor cortex of the brain.
The neurons in their primary motor cortex responded to the movements of the arm.
Implanted electrodes recorded activity in the motor cortex regions of the
  animals' brains while they performed the task.
Those are parts of the visual cortex, parts of the motor cortex and certain
  motion-sensing areas deeper in the brain.
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