CEREBELLUM

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1 CEREBELLUM

CEREBELLUM:

2 CEREBELLUM Head ganglion of proprioception / Small brain FUNCTIONS Equilibrium Tone Muscle Co-ordination

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3 LOCATION

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4

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5 GROSS ANATOMY

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6

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8

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9 MORPHOLOGICAL SUBDIV OF CEREBELLUM

MORPHOLOGICAL SUBDIV OF CEREBELLUM:

MORPHOLOGICAL SUBDIV OF CEREBELLUM LOBES PARTS OF VERMIS PARTS OF HEMISPHERES ANT LOBE LINGULA CENTRAL LOBULE CULMEN --- ALA ANT QUADRANGULAR LOBULE POST LOBE DECLIVE FOLIUM TUBER PYRAMIS UVULA POST QUADRANGULAR LOBULE SUPERIOR SEMILUNAR LOBULE INF SEMILUNAR LOBULE BIVENTRAL LOBULE TONSIL FLOCCULO NODULAR LOBE NODULE FLOCCULUS 10

PHYLOGENETIC SUBDIVISIONS:

11 Archicerebellum Paleocerebellum 3.Neocerebellum PHYLOGENETIC SUBDIVISIONS

FUNCTIONAL SUBDIVISIONS:

12 FUNCTIONAL SUBDIVISIONS

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Zonation of Cerebellum.

Functional organization of cerebellar outputs:

Functional organization of cerebellar outputs

COMPONENTS , CONNECTIONS & PHYLOGENETIC SUBDIV OF CEREBELLUM:

COMPONENTS , CONNECTIONS & PHYLOGENETIC SUBDIV OF CEREBELLUM PHYLOGENETIC SUBDIV ANATOMICAL COMPONENT CHIEF CONNECTIONS FUNCTIONAL CLASSIFICATION ARCHI CEREBELLUM FN LOBE &LINGULA VESTIBULAR APP VESTIBULOCEREBELLUM PALEO CEREBELLUM ANT LOBE ( EX LINGULA) PYRAMID &UVULA SPINAL CORD SPINOCEREBELLUM NEO CEREBELLUM POST LOBE (EX PYRAMID & UVULA) PONS CEREBROCEREBELLUM 15

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16 BLOOD SUPPLY

INTERNAL STRUCTURE:

INTERNAL STRUCTURE 17

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18 CYTOARCHITECTURE

CEREBELLAR GLOMERULUS:

CEREBELLAR GLOMERULUS 19

WHITE MATER OF CEREBELLUM:

20 WHITE MATER OF CEREBELLUM Internal fibers External fibers

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21 The Three Peduncles

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22 CEREBELLAR NUCLEI

Cerebellar circuit:

Cerebellar circuit

FIBER COMPONENTS OF INFERIOR CEREBELLAR PEDUNCLE :

AFFERENTS EFFERENTS Posterior spinocerebellar Cuneocerebellar Olivocerebellar Parolivocerebellar Reticulocerebellar Vestibulocerebellar Ant ext arcuate fibers Fibers of striae medullares Trigeminocerebellar Cerebello-olivary Cerebelloreticular Cerebellovestibular Cerebellospinal 24 FIBER COMPONENTS OF INFERIOR CEREBELLAR PEDUNCLE

FIBER COMPONENTS OF MIDDLE CEREBELLAR PEDUNCLE :

ONLY AFFERENTS PONTOCEREBELLAR 25 FIBER COMPONENTS OF MIDDLE CEREBELLAR PEDUNCLE

FIBER COMPONENTS OF SUPERIOR CEREBELLAR PEDUNCLE :

FIBER COMPONENTS OF SUPERIOR CEREBELLAR PEDUNCLE AFFERENTS EFFERENTS Ventral spinocerebellar Rostral spinocerebellar Tectocerebellar Rubrocerebellar Trigeminocerebellar Hypothalamocerebellar Coerulocerebellar Cerebellorubral Cerebellothalamic Cerebelloreticular Cerebello-olivary 26

CLINICAL CONSIDERATIONS:

27 CLINICAL CONSIDERATIONS CEREBELLAR LESIONS: Cerebellar syndrome (S/S on the side of lesion) Archicerebellar Syndrome Gait & Equilibrium Trunkal ataxia & Staggering gait Nystagmus Rhomberg ᾿ s syndrome

CLINICAL CONSIDERATIONS:

B) Paleocerebellar syndrome Hypotonia asthenia Flail joints Disturbances of tendon reflexes Pendular knee jerk Ataxia 28 CLINICAL CONSIDERATIONS

CLINICAL CONSIDERATIONS:

29 C) Neocerebellar or Lat Cerebellar Syndrome Asynergia Ataxia Dysmetria Dysdiadochokinesis Dysarthria (Scanning speech) Intention Tremors Rebound Phenomenon CLINICAL CONSIDERATIONS

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CEREBELLUM & BASAL GANGLIA OPPOSITE EFFECTS Cerebellar lesions : ↓ muscle tone intentional tremors Basal ganglia lesions: ↑ muscle tone resting tremors 30

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