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Webber_C Cerebellum 2018.pptx - Cerebellum- Objectives 1....

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1.Describe the location & basic structural/functionalorganization of the cerebellum2.Explain the general functions of the cerebellum & the role itplays in influencingthe outputs of the motor systems3.Describe the basic functional unit of the cerebellum & explainhow it works4.Describe the gross anatomical features of the cerebellum &its deep nuclei5.Name the 3 cerebellar peduncles and the fiber tracts theyconvey6.Describe the anatomical divisions of the cerebellum as theyrelate to its functional subdivisions & name the motor systemsthey influence7.Describe the clinical syndromes resulting from lesionsaffecting the cerebellar vermis and cerebellar hemispheresCerebellum- Objectives
1.Largest part of Hindbrain2.Posterior Cranial Fossa3.Under TentoriumCerebellum4.Covered by 3 meninges5.2/3 of walls of 4thVentricle6.Surrounded by CSF1.Medial apperature(Foramen of Magendie)2.Lateral aperatures(Foramina of Luschka )7.Cisterna Magna8.Connects to Brainstem via3 Peduncles9.10% total brain volume;>50% of neuronsWhat we know so far about the Cerebellum:
Courtesy of Stephen C. Voron, MDCerebellum:-consultanton rapidmovements(ie: Thebrain's motorcortex tellsyour legs tostart walking.&Cb keepsyour stridesmooth andsteady andbalanced.-providesinput tothalamus andonto cortexCBT
Cerebellum ‘little brain’Part ofmotor systemb/c cerebellar damage= movement stillpossible, but the patient has:Gait imbalance, Poor postural controlPoor coordination of voluntary movements, slurred speechFunctions of the Cerebellum (all unconscious)Controls equilibrium/balanceControls posture and muscle toneCoordinates smooth purposeful movementsHowever…cerebellum is also involved insensory informationprocessingSee Slide 41
Ultimately, the cerebellum is the great comparator:1.It compares cortical willful command with muscle tension,joint position, & tone (via ipsilateral spinocerebellar tracts)2.Cb advises the cortex onhow much, how many, how fastThen…3.The motor cortex sends the revised command down thecorticospinal tract
Inferior cerebellarPeduncle (ICP)CEREBELLUMSpinocerebellar TractsUpper & Lower limbs(mm.spindles,tendon organs)Corticopontocerebellar tract(premotor/suppl. Motor Ctx)Middle cerebellarPeduncle (MCP)1.Corticopontocerebellartract2. Spinocerebellar tracts(ipsilateral)Cerebellum receives 2 afferent tracts:
In summary: Cerebellum receives motor & sensoryafferentsMotor (Corticopontocerebellar tracts)Motor areas of the cortex concerned with planning &executing movement(premotor and supplementary motor cortex)Sensory (Spinocerebellar tracts)Peripheral nervous system (mostly proprioceptive frommuscles and tendons) from ongoing and evolvingmovement.
Ultimately, the cerebellum is the great comparator:1.It compares cortical willful command with muscle tension,joint position, & tone (via ipsilateral spinocerebellar tracts)2.Cb advises the cortex onhow much, how many, how fastThen…3.The motor cortex sends the revised command down thecorticospinal tract

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Term
Fall
Professor
NoProfessor
Tags
motor cortex, inferior cerebellar peduncle, Deep cerebellar nuclei, Cerebellar vermis

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