Vermis Health Dictionary

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Vermis: From 1 Different Sources

n. the central portion of the *cerebellum, lying between its two lateral hemispheres and immediately behind the pons and the medulla oblongata of the hindbrain.
Health Source: Oxford | Concise Colour Medical Dictionary
Author: Jonathan Law, Elizabeth Martin

Cerebellum

n. the largest part of the hindbrain, bulging back behind the pons and the medulla oblongata and overhung by the occipital lobes of the cerebrum. Like the cerebrum, it has an outer grey cortex and a core of white matter. Three broad bands of nerve fibres – the inferior, middle, and superior cerebellar peduncles – connect it to the medulla, the pons, and the midbrain respectively. It has two hemispheres, one on each side of the central region (the vermis), and its surface is thrown into thin folds called folia (see illustration). Within lie four pairs of nuclei.

The cerebellum is essential for the maintenance of muscle tone, balance, and the synchronization of activity in groups of muscles under voluntary control, converting muscular contractions into smooth coordinated movement. It does not, however, initiate movement and plays no part in the perception of conscious sensations or in intelligence. —cerebellar adj.... cerebellum

Pyramid

n. 1. one of the conical masses that make up the medulla of the *kidney, extending inwards from a base inside the cortex towards the pelvis of the kidney. 2. one of the elongated bulging areas on the anterior surface of the *medulla oblongata in the brain, extending downwards to the spinal cord. 3. one of the divisions of the vermis of the *cerebellum in the middle lobe. 4. a protrusion of the medial wall of the vestibule of the middle ear.... pyramid

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