What motor functions do basal nuclei and cerebellum perform?

Answer 1

The basal ganglia is involved in initiating movement and inhibiting unnecessary motor outputs from reaching the other parts of the motor system. In parkinsons the substantia nigra of the basal ganglia is destroyed, allowing these extra motor inputs through, hence the jerky, constant movements.

The cerebellum co-ordinates all muscle movements so that fluid movements can take place. If you need to pick up a pen, your cerebellum will co-ordinate all the movements of all the muscles involved so that they happen at the correct amount and time, and in the correct sequence.

Your cerebellum also controls anti-gravity muscles, which are responsible for maintaining correct balance and posture, which they do without concious input.

Answer 2

Basal nuclei are involved in initiating and modulating voluntary movement, while the cerebellum is responsible for coordinating and fine-tuning motor control, balance, and posture. Both structures work together to ensure smooth and precise movement execution.