The completion of any body movement depends on the coordinated movement of a certain group of muscles, which is * * * economic movement. This coordination mainly depends on the function of cerebellum to coordinate muscle activity, maintain balance and help control posture. It also needs the normal muscle strength of motor system, the balance function of vestibular nervous system, the coordination of eye, head and body movements, and the sense of position of sensory system. Any damage to these parts may lead to ataxia.

Simply put, it means that the limbs are not coordinated, such as 1. The finger nose experiment is to let the patient lie on his back, with his index finger touching the examiner's index finger 0.5cm in front of them, and then point his nose with his index finger. From slow to fast, they open their eyes first and then close them, and so on. When the cerebellar hemisphere is diseased, the fingers and nose on the same side are not accurate. If the fingers and nose are accurate when opening eyes, the disorder when closing eyes is sensory ataxia. 2. Heel-knee-tibia experiment instructs the patient to lie on his back, lift one lower limb, put the heel on the lower knee of the other lower limb, and then move down along the front edge of the tibia, opening his eyes first, then closing his eyes, and repeating. When the cerebellum is damaged, the movement is unstable, and it is difficult for people with sensory ataxia to find their knees with their heels closed. 3. Other A rapid rotation movements: instruct the patient to straighten the palm, quickly pronate and supinate the forearm, or slap the opposite palm alternately with one hand and the back of the hand continuously. The ataxia person's movements are slow and uncoordinated; B Signs of difficulty in closing eyes: instruct patients to stand with their heels together, close their eyes and extend their hands horizontally forward. If the body shakes or leans, it is positive, suggesting cerebellar lesions. If you can stand firm with your eyes open and unstable with your eyes closed, it is sensory ataxia.