The midbrain is the smallest region of the brain that acts as a sort of relay station for auditory and visual information. The midbrain controls many important functions such as the visual and auditory systems as well as eye movement.

Portions of the midbrain called the red nucleus and the substantial nigra are involved in the control of body movement. The midbrain, also called the mesencephalon, is a small region of the brain that serves as a relay center for visual, auditory, and motor systems information.