More complex patterns of movements, such as throwing a ball or picking up a fork, are controlled by which portion of the frontal lobe?
A) Premotor cortex
B) Primary motor cortex
C) Reflexive circuitry
D) Supplementary motor cortex
Ans: A
Feedback:
Nerve signals generated by the premotor cortex produce much more complex "patterns" of movement; the movement pattern to accomplish a particular objective, such as throwing a ball or picking up a fork, is programmed by the prefrontal association cortex and associated thalamic nuclei. The primary motor cortex is concerned with the purpose and planning of the motor movement and controls specific muscle movement sequences. The lowest level of the hierarchy occurs at the spinal cord, which contains the basic reflex circuitry needed to coordinate the function of the motor units involved in the planned movement. The supplementary motor cortex, which contains representations of all parts of the body, is involved in the performance of complex, skillful movements that require coordination of both sides of the body.
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