Final answer:
The newest upper motor neuron (UMN) pathway has roles in coordination of complex movements, maintaining muscle tone, and controlling visceral functions.
Step-by-step explanation:
The newest upper motor neuron (UMN) pathway has various roles, including:
Coordination of complex movement For example, the UMN pathway helps coordinate movements like walking, running, and playing a musical instrument. It also helps regulate muscle tone, preventing muscles from being too loose or too stiff. Additionally, the UMN pathway plays a role in controlling visceral functions such as digestion and breathing.