The human brain comprises several distinct structures, each with its functions. These structures form three major brain components that have emerged at various points along our evolutionary journey. The hindbrain situates in the lower area of the brain. It is where the spinal cord enters the skull and was the first to appear in evolution and the first to appear in prenatal development. The hindbrain comprises several smaller structures, such as the medulla, pons, and cerebellum. These structures are involved in the basic physiology of human beings, like sleeping, breathing, eating, heartbeat, etc. The cerebellum, located in the lower back of the brain, is involved in complex motor behaviors such as walking, riding a bicycle, and playing racquetball.