Cerebellum - PowerPoint PPT Presentation

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Cerebellum

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Receives sensory info from somatosensory, vestibular, visual and auditory areas. 2 ... Inability to fixate on object. eyes drift away from it, with rapid return. 5 ... – PowerPoint PPT presentation

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Title: Cerebellum


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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