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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
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
3 divisions of cerebellum
  • Vestibulocerebellum
  • Spinocerebellum
  • Neocerebellum
  • Different lesions produce different clinical deficits
vestibulocerebellum
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
vestibulocerebellum4
Vestibulocerebellum
  • Cerebellar nystagmus
    • Inability to fixate on object.
    • eyes drift away from it, with rapid return.
vestibulocerebellum5
Vestibulocerebellum
  • Damage  decreased reflexes
  • Postural instability
  • Experience nausea
spinocerebellum
Spinocerebellum
  • Ascending sensory inputs via S.C.
  • Descending motor outputs
  • Damage  problems with smooth control of motor movements
    • Problems walking
      • Bowlegged stance
spinocerebellum7
Spinocerebellum
  • Damage  rapid pointing often extends past target
    • Hypermetria
  • Damage  difficulty stopping movement
    • As arm approaches target, goes into oscillations
neocerebellum
Neocerebellum
  • Control of voluntary movements
neocerebellum9
Neocerebellum
  • Damage leads to:
    • Clumsy movements
    • Hypermetria
      • Especially in sequences of gestures
    • Movements req. coordination of many body parts
    • Prolonged initiation of movements
neocerebellum10
Neocerebellum
  • Lesions result in deficits similar to spinocerebellum
  • Neocerebellum - planning movements
  • Spinocerebellum – regulating actual performance
cerebellum11
Cerebellum
  • Alcohol may affect cerebellum
    • Sobriety tests often assess cerebellar functioning
      • Balance
      • Touching finger to nose