The cerebellum is similar to the cerebrum in that it has two hemispheres and has a highly folded surface or cortex. This structure is associated with regulation and coordination of movement, posture, and balance. The cerebellum lies on top of the pons, behind the brain stem. The cerebellum is comprised of small lobes and receives information from the balance system of the inner ear, sensory nerves, and the auditory and visual systems.


The cerebellum is involved in the coordination of voluntary motor movement, balance and equilibrium and muscle tone. It is also responsible for the basic facets of memory and learning.

It is relatively well protected from trauma compared to the frontal and temporal lobes and brain stem. Cerebellar injury results in movements that are slow and uncoordinated. Individuals with cerebellar lesions tend to sway and stagger when walking.

Damage to the cerebellum can lead to:
1) Asynergia- loss of coordination of motor movement
2) Dysmetria- the inability to judge distance and when to stop
3) Adiadochokinesia- the inability to perform rapid alternating movements
4) Intention tremor- movement tremors
5) Ataxic gait- staggering, wide based walking
6) Tendency toward falling
7) Hypontonia- weak muscles
8) Ataxic dysarthria- slurred speech
9) Nystagmus- abnormal eye movements

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