Answer
The anterior and posterior spino-cerebellar tracts carry information from the proprioceptors of the joints and muscle to the cerebellum. The cerebellum uses this information to smooth-out skeletal muscle contractions during skilled movements or tasks. The cerebellum also uses this information to maintain balance and posture(position).
Work Step by Step
When a movement or course of action is considered,the cerebellum monitors input of the intended action or movement. This input derives from the motor cortex and the basal nuclei. Next, when the action or movement is executed, input from the proprioceptors is sent to the cerebellum via the anterior and posterior spinocerebellar tracts. The cerebellum proceeds to compare the intended movement with the actual movement. If there is a discrepancy (error) between the intended and the actual, he cerebellum continuously sends corrections to the muscles until the error is smoothed out, and the intended action is smoothly executed. . This coordinating action of the cerebellum is important in learning and performing skilled tasks like hitting a baseball, typing, playing soccer, and swimming.
The cerebellum also has the function of helping to maintain proper balance and posture. In these functions it also uses inputs from the eyes and from the vestibular apparatus of the ears.
