What structure is NOT a part of the brain stem?

The cerebellum is not a part of the brain stem. It is a distinct structure located behind and beneath the brain stem, primarily involved in motor control, coordination, balance, and motor learning. While the brain stem consists of the midbrain, pons, and medulla oblongata, the cerebellum operates in conjunction with these structures to refine movements and ensure smooth execution of motor commands. Understanding the anatomy of the brain is crucial, as each part plays specific roles in various aspects of communication and motor control. The brain stem itself is essential for regulating vital functions and relaying signals between the brain and body, while the cerebellum focuses on the precision and timing of those movements and skills.