Answer
The basal nuclei are of vital importance in controlling muske movements. They determine the initiation and termination of intentional movements like movements of hips and shoulders in walking;, and learned behaviors like driving, writing, and typing.
Work Step by Step
The basal nuclei are part of a positive feedback loop that includes cerebrum, nuclei and thalamus . Signals go to the basal nuclei from substantia nigra of the midbrain and from all of the cerebral cortex --except the primary visual, and auditory cortices. Signals received by the basal nuclei are processed, and instructions are sent to the thalamus. The thalamus then relays these signals to the midbrain and cerebral cortex --including precentral gyrus, motor association area and precentral cortex .
Injury to basal nuclei results in movement disorders as is seen generally in dyskinesia disorders, and specifically in Parkinson disease. Some of these orders are characterized by difficulty in initiating movements and in executing smooth easy movements . In others, the problems are exaggerated unwanted movements
