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CEREBRUM

The cerebrum is the largest part of the brain and consists of two cerebral hemispheres connected by a mass of white matter called the corpus callosum.
Each hemisphere extends from the frontal to the occipital bones; above the anterior and middle cranial fossae; and, posteriorly, above the tentorium cerebelli.

CEREBELLUM

The largest part of hind brain Lies above and behind the medulla and pons and occupies posterior cranial fossa and separated from them by the cavity of the 4 th ventricle and separated from Occipital part of each cerebral hemispheres by tentorium Cerebelli.

External Features

It is consist of two hemispheres connected by , The part of vermis that seen from above is the superior vermis while that seen from below is inferior vermis also it consist of two surfaces superior and inferior. And it has two notches anterior and posterior .The anterior one receive the back of the brain stem and the posterior one receive the falx cerebella. It has an outer grey matter and inner white matter. It is like cerebral hemispheres . Its surface is high convoluted, forming folds or folia, being oriented transversely. shows the fissure prima that separates the anterior lobe from the middle . shows depression called vallecula at the bottom of the vallecula we have inferior vermis (formed of nodule,uvula and pyramid ). Also we have tonsil of the cerebellum in the inferior surface situated at the side of the inferior vermis.

The Cerebellum has three fissures

Primary Fissure: V-shaped , well defined fissure, lies on superior surface and separates the small anterior lobe from the larger middle lobe (or posterior lobe).
Horizontal Fissure: lies along the sides of cerebellum, extending from anterior notch to posterior notch, separates the superior from the inferior surfaces.
Secondary Fissure: lies on inferior surface and separates flocculo-nodular lobe from the remainder of cerebellum.

Function of Cerebellum

The smallest region, the Flocculonodular lobe, is often called the vestibulocerebellum . participates mainly in balance and spatial orientation; its primary connections are with the vestibular nuclei, although it also receives visual and other sensory input. Damage to it causes disturbances of balance and gait.
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