Which region of the brain contains centers for body movement and relays impulses related to movement?

The midbrain is a crucial region of the brain that plays a significant role in coordinating sensory information and motor control. It contains specific structures such as the substantia nigra, which is involved in the regulation of movement and is essential for smooth and coordinated muscle activity. The midbrain also serves as a conduit for pathways between the brain's higher centers and the lower parts of the brain and spinal cord, thus relaying impulses that facilitate body movement.

The cerebellum, while also involved in motor control, primarily focuses on the coordination and fine-tuning of movements rather than initiating them. The cerebrum is responsible for higher-level functions, including decision making and planning movements but is not primarily a center for the relay of movement impulses. The thalamus acts as a relay station for sensory and motor signals but does not contain centers specifically dedicated to body movement like the midbrain does.