Cerebellum

Dr.Sajith.S

The term cerebellum is from “Latin meaning” the little brain. It is a part of the hindbrain situated in the posterior cranial fossa.

only 10 % total volume of the brain but more than half of all its neurons.

It is present behind the Pons and medulla oblongata , separated by fourth ventricle.

• It is covered by tentorium cerebelli and connected to brain stem by three cerebellar peduncles.

• Surface is divided by numerous curve transverse fissures giving it a laminated appearance.

Surfaces

Superior surface ( Tentorial )

Inferior surface ( Suboccipital )

Anterior surface ( Petrosal )

pedunclesSuperior cerebellar peduncle :Connects to midbrain.Contains efferent fiber systems extending

to red nucleus and thalamus.

Middle cerebellar peduncle :Connects to ponsContains fiber mass orginating from

pontine nuclei and represent continuation of corticopontine tracts.

Inferior cerebellar peduncle :Connects to medulla.Contains spinocerebellar tracts and

connections to vestibular nuclei.

Superior cerebellar peduncle

Midbrain Middle cerebellar

peduncle

PonsInferior cerebellar peduncle

Medulla ablongata

Blood supply

Vertebrobasilar circulation

Superior cerebellar arteryAnterior inferior cerebellar arteryPosterior inferior cerebellar artery

cerebellum

Consists of two laterally, large hemisphere which are united by midline vermis.

Horizontal fissure

Vermis

Hemisphere

Superior surface

horizontal fissure

Extends around dorsolateral border of each hemisphere from middle cerebellar peduncle to vallecula, seperating superior and inferior surface.

Primary fissure

The deepest fissure in the vermis is primary fissure, which curves ventrolaterally in the superior surface of the cerebellum to meet horizontal fissure.

Primary fissure divides the cerebellum into anterior and posterior lobe.

Horizontal fissure

Primary fissure

Anterior

lobe

Posterior lobe

Hemisphere

Lobes of cerebellam

Anterior lobe

Posterior lobe

Flocculonodular lobe

Vermis Hemisphere

Subdivision of Flocculonodular Lobe Nodulus Flocculus

Subdivision of Anterior Lobe

Lingula Central Lobule Ala Central Lobule

Culmen Quadrangular Lobule

Vermis Hemisphere Subdivision of Posterior Lobe Declive Simple Lobule

Folium Superior Semilunar Lobule Horizontal fissure

Inferior Semilunar Lobule Tuber Gracile Lobule Prepyramidal fissure

Pyramid Biventral Lobule

Uvula Tonsil

Fourth ventricle

Arbor vitae cerebelli

Arbor vitae

In latin “ tree of life”

It is so called because of the tree like appearance.

It is the white matter of the cerebellum.

It brings sensory and motor sensation to and from cerebellum.

Deep cerebrallar nuclei

Fastigial Nuclei ( medial group )

Nucleus Interpositus ( intermediate group )

Globose Nucleus Emboliform Nucleus

Dentate Nucleus ( lateral group )

Dentate nucleus

Emboliform nucleus

Globose nucleus

Fastigial nucleus Nucleus interpositus

Fastigial nucleus :Fibers from vermis cortex , vestibular

nuclei and other medulla nuclei.Globose nucleus :Fibers from vermis cortex, sends

fibers to medulla nuclei.Emboliform nucleus :Fibers from cerebellar cortex

between vermis and hemispheres, sends fibers to thalamus.

Dentate nucleus :Fibers from hemispheric cortex,

sends fibers to red nucleus and thalamus.

AXIAL

coronal

sagittal

Thanks to cerebellum!!!