Final answer:
The ascending tract to the cerebellum is crucial for the coordination of skeletal muscles. This involves the cerebellum comparing intended motor commands from the cerebrum with actual body movement and position, then sending corrective commands to achieve smooth and coordinated movement.
Step-by-step explanation:
The ascending tract to the cerebellum, such as the input from the inferior olive and collateral branches of corticospinal fibers projecting to the cerebellum through the pons, is necessary for the coordination of skeletal muscles. This is because the cerebellum plays a critical role in ensuring smooth and coordinated muscle movements by comparing intended movements (motor commands sent by the cerebrum) with the actual position and motion of the body (sensory feedback from proprioceptors). The cerebellum then sends corrective commands via tracts such as the rubrospinal tract to adjust movements and maintain balance and coordination. A familiar example of the cerebellum's corrective function is seen when trying to walk through water; despite the resistance, the cerebellum adjusts the motor command to allow for larger steps. When the cerebellum is impaired, it can lead to difficulties in coordination and balance, as seen with alcohol overconsumption inhibiting cerebellar function.