The cerebellum is located behind the brain stem; it consists of two hemispheres connected by a worm. Hemisphere is covered with bark of the gray matt

Cerebellum structure and functions

The cerebellum is located behind the brain stem; it consists of two hemispheres connected by a worm. Hemisphere is covered with bark of the gray matter. The white matter of the cerebellum hemispheres has many nuclei. It’s connected via legs (pathways) with all parts of the central nervous system, but has no direct links with the receptors and efferent neurons. Therefore, its effect is mediated through other CNS parts.

Cerebellum plays an important role in the coordination of movements, maintaining body balance and muscle tone. By influencing the centers of the autonomic nervous system, it causes changes in the activity of internal organs needed for physical activity. The cerebellum is the main governing organ of the human motor system.

Diagram 150. Violation of the functions of the cerebellum: 1 — shake hands with finger-nose test; 2 — unstable posture; 3 — staggering gait; 4 — a violation of writing

Violation of cerebellum functions causes changes in human motor coordination and muscle tone, which is manifested in muscle trembling (tremor), impaired eyes concentration (nystagmus). Person’s gait with a damaged cerebellum resembles a drunken gait. Gradually cerebellar functions are assumed by the other CNS divisions, and the symptoms mentioned above disappear. Taken from http://worldofschool.org

It is known that alcohol disrupts the coordination function of the cerebellum. Human movement is slow, poorly coordinated. In a state of alcohol intoxication, he cannot stop in time, and instead of making a single step makes three or four. Violation of the cerebellum functions with the use of alcohol can cause accidents, especially while driving.

Coordination function checks by finger-nose test when you need to touch your nose with a finger while eyes are closed. A healthy person can perform this exercise without any effort, although it attends 33 muscles.

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