The cerebellar hemispheres are the two large lateral lobes of the cerebellum on either side of the vermis. Their intermediate zone helps control ongoing limb movements, while the large lateral zone works with the cerebral cortex to plan and time skilled movements. Each hemisphere controls the same side of the body.
| Location | Posterior cranial fossa, on either side of the vermis, beneath the tentorium cerebelli and occipital lobes |
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| Parts |
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| Connections |
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| Blood Supply | Superior cerebellar artery; Anterior inferior cerebellar artery; Posterior inferior cerebellar artery |
Coordinate limb movements on the same side of the body, controlling direction, speed, force and timing, and support motor planning and learning.
Hemisphere lesions cause ipsilateral limb ataxia: intention tremor, past-pointing on the finger-nose test, clumsy rapid alternating movements (dysdiadochokinesia) and rebound. Because the cerebellar output crosses twice, damage shows on the same side as the lesion. Lateral cerebellar damage can also cause subtle problems with planning and language, the cerebellar cognitive affective syndrome.
Clumsy, poorly aimed movements with intention tremor on the same side as a cerebellar hemisphere lesion.
Bleeding in a cerebellar hemisphere, often hypertensive, causing headache, vomiting and ataxia, which may need surgical evacuation if the brainstem is compressed.
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