The human brain is a complex organ, mainly composed of three components: the brainstem, cerebellum, and cerebrum. Each part has its own function and physiological structure.

Brainstem: Located between the brain and spinal cord, the brainstem is an important passageway connecting the brain to the rest of the body. The brainstem controls many basic life functions such as breathing, heartbeat, and blood pressure. It also regulates physiological processes such as sleep, wakefulness, and digestion.

Cerebellum: The cerebellum is located below the brain and accounts for about 10% of the brain's weight. The cerebellum is mainly responsible for coordinating and regulating movement, making the body's movements more coordinated and precise. It is also related to aspects such as balance control and spatial orientation.

Brain: The brain is the center of human thinking, memory, learning, perception and movement control. The brain is made up of two hemispheres, which control the left and right parts of the body respectively. The cerebral cortex is the outermost layer of the brain. It is the high-level functional area of ??the brain and is responsible for language, thinking, perception, memory, and decision-making.