Nonprimary motor cortex:
region of the frontal cortex involved in movement but distinct from the primary motor cortex. The nonprimary motor cortex contains several areas, such as the premotor and supplementary motor areas, involved with various aspects of movement like planning, initiating, and selecting the proper movement given a particular context.
Learn more: Know your brain - Motor cortex
Watch this 2-Minute Neuroscience video to learn more about the motor cortex.