basal ganglia dysfunction

Basal ganglia are clusters of neurons deep within the brain, beneath the cerebral cortex. They are crucial for processing movement information, fine-tuning brain circuits, and selecting appropriate responses. These nuclei play a key role in planning actions, executing habitual movements, and learning new ones.1

Dysfunction in the basal ganglia can lead to movement disorders. For instance, a loss of dopamine-producing neurons in the substantia nigra is the primary cause of Parkinson disease, characterized by slowness of movement and rigidity. Conversely, disorders like Huntington disease involve involuntary movements due to damage in the striatum. Basal ganglia diseases result in a loss of control over movement, manifesting as involuntary actions or reduced speed and spontaneity of voluntary movements. Beyond motor control, basal ganglia dysfunction can also impact cognitive functions and behavior.123