Skip to main content
Posts
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.