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Cerebellum

Cerebellum. More cells in cerebellum than rest of nervous system combined Receives sensory info from somatosensory, vestibular, visual and auditory areas. 3 divisions of cerebellum. Vestibulocerebellum Spinocerebellum Neocerebellum Different lesions produce different clinical deficits.

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Cerebellum

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  1. Cerebellum • More cells in cerebellum than rest of nervous system combined • Receives sensory info from somatosensory, vestibular, visual and auditory areas

  2. 3 divisions of cerebellum • Vestibulocerebellum • Spinocerebellum • Neocerebellum • Different lesions produce different clinical deficits

  3. Vestibulocerebellum • Input from & output to brainstem vestibular nuclei • For balance • For coordinating eye & body movements • Vestibulo-ocular reflex • Allows eyes to remain fixed on an object despite head or body movements

  4. Vestibulocerebellum • Cerebellar nystagmus • Inability to fixate on object. • eyes drift away from it, with rapid return.

  5. Vestibulocerebellum • Damage  decreased reflexes • Postural instability • Experience nausea

  6. Spinocerebellum • Ascending sensory inputs via S.C. • Descending motor outputs • Damage  problems with smooth control of motor movements • Problems walking • Bowlegged stance

  7. Spinocerebellum • Damage  rapid pointing often extends past target • Hypermetria • Damage  difficulty stopping movement • As arm approaches target, goes into oscillations

  8. Neocerebellum • Control of voluntary movements

  9. Neocerebellum • Damage leads to: • Clumsy movements • Hypermetria • Especially in sequences of gestures • Movements req. coordination of many body parts • Prolonged initiation of movements

  10. Neocerebellum • Lesions result in deficits similar to spinocerebellum • Neocerebellum - planning movements • Spinocerebellum – regulating actual performance

  11. Cerebellum • Alcohol may affect cerebellum • Sobriety tests often assess cerebellar functioning • Balance • Touching finger to nose

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