CABM FIBMS College of Medicine University of Basrah Objectives What is cerebellum The Functions of cerebellum Anatomical areas of cerebellum Input afferent Pathways to the Cerebellum Output Efferent Signals from the Cerebellum ID: 1042539
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1. CerebellumMustafa Al-Badran CABM FIBMSCollege of Medicine\ University of Basrah
2. ObjectivesWhat is cerebellumThe Functions of cerebellumAnatomical areas of cerebellumInput (afferent) Pathways to the CerebellumOutput (Efferent) Signals from the CerebellumFunctional divisions of CerebellumUniversity of Basrah-College of Medicine-Physiology Department1
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5. Anatomical and Functional areas of cerebellumThe cerebellum is divided into three lobes by two deep fissuresThe Anterior lobeThe Posterior lobeThe Flocculonodular lobeUniversity of Basrah-College of Medicine-Physiology Department4
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9. Input (Afferent) Pathways to the CerebellumFrom other parts of brainMotor and Somatosensory cortices through corticopontocerebellar pathway to lateral divisions of cerebellar hemisphere on opposite side Brainstem throughOlivocerebellar tractVestibulocerebellar tract Reticulocerebellar tractUniversity of Basrah-College of Medicine-Physiology Department8
10. From the peripheryDorsal Spinocerebellar tractTransmit input signals fromMuscle spindlesGolgi tendon organs, large tactile receptors of skin, and joint receptorsUniversity of Basrah-College of Medicine-Physiology Department9
11. These signals explains cerebellum of momentary status aboutMuscle contractionDegree of tension on muscle tendonPositions and rates of movements of the body partsForces acting on the body surface10University of Basrah-College of Medicine-Physiology Department
12. Ventral Spinocerebellar tractEnter same areas of cerebellum through superior cerebellar peduncle and terminate in both sides of cerebellumThese fibers tell the cerebellum what motor signals are arrived at the anterior hornsUniversity of Basrah-College of Medicine-Physiology Department11
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14. Functional units of cerebellar cortexThree layers form the functional units of cerebellumExternal molecular layerPurkinje cell layer(One-cell thickness) InhibitoryInternal granular layer ExcitatoryUniversity of Basrah-College of Medicine-Physiology Department12
15. Output (Efferent) Signals from the CerebellumThree cerebellar nucleiUniversity of Basrah-College of Medicine-Physiology Department14
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17. Output signals leave deep nuclei of cerebellum and distributed to other parts of brain throughPathway originate in the vermisThrough fastigial nuclei into pons and medulla oblongata of brainstemFunction to:Control equilibrium in association with vestibular apparatusControl postural attitudes of body in association with reticular formationUniversity of Basrah-College of Medicine-Physiology Department15
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19. Pathway originate in intermediate zone passThrough interposal nuclei to Ventrolateral & Ventroanterior nuclei of thalamus to cerebral cortex Several midline structures of thalamus to basal ganglia to Red nucleus and Reticular formation of brainstemFunctions to coordinate reciprocal contractions of agonist and antagonist muscles in hands, fingers, and thumbUniversity of Basrah-College of Medicine-Physiology Department16
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21. Cerebellum Functionally divided overall in toUniversity of Basrah-College of Medicine-Physiology Department17
22. Recap1. Cerebellum receives information from the sensory systems, the spinal cord, and other parts of the brain2. It regulates, coordinates voluntary movements , posture, balance, coordination, and speech3. It helps sequence, and monitor the motor activities4. Anatomically, divided into :the anterior, posterior and flocculonodular lobes5. ReceivesInput from brain (Motor and somatosensory, Brainstem )From the periphery6. Functional units 7. Output Signals from the Cerebellum8. Functional divisions19
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