The entire sensorymotor system is organized as “hierarchy.” Major structures of the motor system include the cerebrum or forebrain, brain-stem and spinal cord. Cerebrum mediates the conscious functions of movement, while the brain stem and spinal cord mediate the autonomous functions.
The pre-frontal cortex plans the movements, the premotor cortex organizes the sequence of movements and the motor cortex executes the performance of movements.
Thus, the blanks can be filled with prefrontal; premotor; motor cortex.