The cerebellum mainly controls body movement balance. From the functional point of view, the cerebellum can be divided into 3 parts: vestibular cerebellum, spinal cerebellum and cortical cerebellum, which are responsible for the following: 1. Vestibular cerebellum: The main function is to control the balance of the body and eye movements. Since the vestibular cerebellum mainly receives balance sensory information about head position change and linear or rotational acceleration from the vestibular organs, and the efferent impulses mainly affect the activities of trunk and proximal limb muscles, it has the role of maintaining body postural balance. The vestibular cerebellum is prone to symptoms such as unstable standing, staggering gait, and easy falling after damage; 2. Spinal cerebellum: The main function is to regulate the ongoing process of movement and assist the cerebral cortex in the timely control of random movements. It is believed that the spinal cerebellum compares and integrates the proprioceptive information from muscles and joints, as well as the feedback from sensory input such as vision and hearing, observes the errors between motor execution and motor commands, corrects the activity of the motor cortex, and corrects the deviations of the movement so that the movement is carried out accurately according to the intended goals and trajectories of the motor cortex. In addition, the spinal cerebellum also has the function of regulating muscle tension, so damage to the spinal cerebellum can be reduced muscle tone, clumsy or inaccurate movement, ataxia, poor distance discrimination, etc.; 3, cortical cerebellum: the cortical cerebellum is mainly involved in the design and programming of random movements, random movements are the body movements under the direct control of the cortical motor areas under the control of consciousness. It is a complex functional system that individuals learn later in life and is in the nature of conditioned reflexes. Patients with damage to the lateral cerebellum may show delayed motor onset and the absence of developed rapid and skilled movements.