The vermis is the narrow, worm-like midline strip of the cerebellum joining the two hemispheres. It controls the muscles of the trunk and the midline of the body, keeping posture and gait steady, and with the fastigial nucleus it helps control eye movements.
| Location | Midline of the cerebellum, between the two hemispheres, forming the roof of the fourth ventricle |
|---|---|
| Parts | |
| Connections |
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| Blood Supply | Superior cerebellar artery (superior vermis); Posterior inferior cerebellar artery (inferior vermis) |
Maintains trunk posture, balance and gait, and contributes to the control of eye movements.
Vermis lesions cause truncal ataxia: a wide-based, staggering gait and difficulty sitting or standing still, often with relatively normal limb coordination. Medulloblastoma and alcohol-related degeneration typically affect the vermis. In Dandy-Walker malformation the vermis is underdeveloped and the fourth ventricle is enlarged.
Unsteady sitting, standing and walking with a broad-based gait caused by damage to the midline vermis.
A congenital malformation with an underdeveloped vermis, cystic enlargement of the fourth ventricle and a large posterior fossa, often with hydrocephalus.
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