The basal ganglia consist of interconnected subcortical nuclei including the striatum, substantia nigra, globus pallidus, and subthalamic nucleus. These structures receive sensory and motor input from the cortex and modulate thalamic activity, which then projects back to the cortex to influence movement control. The basal ganglia regulate the initiation and suppression of voluntary movement, contribute to motor learning, and help prevent unwanted movements. Dysfunction within these circuits is associated with movement disorders such as Parkinson’s disease and Huntington’s disease.
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