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What inputs does the ventral anterior nucleus receive from the basal ganglia?

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Diagram of a human brain showing a median sagittal section, highlighting the fourth ventricle and cerebellum in the hindbrain, with labeled anatomical structures including the pons, medulla oblongata, and central canal of the spinal cord. — thalamus Sagittal section of the human brain, showing structures of the cerebellum, brainstem, and cerebral ventricles.

The ventral anterior (VA) nucleus of the thalamus receives topographically segregated input from two primary neuron clusters within the basal ganglia:

The substantia nigra pars reticulata
The globus pallidus pars interna (GPi)

These inputs are essential for the VA nucleus's role in the induction, execution, and control of voluntary movement, as the nucleus subsequently projects this information to the premotor cortex, the supplementary motor area, and the primary motor cortex.1