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Circuitry of the Basal Ganglia, part 2

Next, we will consider two major brain systems that modulate the output of upper motor neuronal circuits: the basal ganglia and the cerebellum. Take note: the output of these systems is NOT directed at lower motor circuits directly; rather, their output engages the motor thalamus and brainstem upper motor neuronal circuits. Thus, the actions of the basal ganglia and cerebellum are to modulate, rather than command, the activities of upper motor neurons. As you study the lessons in this module, appreciate how the basal ganglia and cerebellum function in a somewhat complementary fashion to modulate the initiation and coordination of movement, respectively.

杜克大学
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