The ability that humans have to perform very skilled movements such as writing is controlled by the:
a. Basal ganglia.
b. Corticospinal tract.
c. Spinothalamic tract.
d. Extrapyramidal tract.
ANS: B
Corticospinal fibers mediate voluntary movement, particularly very skilled, discrete, and purposeful movements, such as writing. The corticospinal tract, also known as the pyramidal tract, is a newer, "higher" motor system that humans have that permits very skilled and purposeful movements. The other responses are not related to skilled movements.
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