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25 Cards in this Set
- Front
- Back
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inputs into the cerebellum |
-CN VIII and other visual signals -vestibular: vestibular nuclei -proprioception inputs: dorsal nucleus of clarke, mesencephalic nucleus of trigeminal nerve movement: external cuneate nucleus -auditory systems -cerebral cortex |
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is the cerebellum ipselateral or contralateral? |
-ipselateral to body parts it represents -cortical input crosses over to reach the cerebellum |
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what is the general pattern of cerebellar outputs? |
inputs excite the cerebellar cortex, which inhibits the cerebellar nuclei, which excites the outputs |
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what are the deep nuclei of the vestibulocerebellum? |
vestibular nuclei |
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what are the outputs of the vestibulocerebellum? |
vestibulospinal tracts and eye movements (MLF) |
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what is the deep cerebellar nuclei of the cerebroscerebellum? |
dentate nucleus (teeth are closest to the top of the body, first letter in don't eat greasy food) |
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what are the outputs of the cerebrocerebellum? |
va/vl thalamus (same as basal ganglia) -red nucleus (parvocellular red nucleus, not same as rubrospinal tract) |
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what is the deep nuclei in the spinocerebellum? |
interposed (embolliform and globular) and fastigial nuclei |
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what are the outputs of the spinocerebellum? |
VL thalamus, brain stem structures: reticular formation (reticulospinal tract involved in posture and movement), red nucleus and rubrospinal tract superior colliculus (eye movements and related movements) |
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what are the three cell layers of the cerebellum? |
molecular (top), purkinje (where purkinje cells are), granule (where granule cells are) |
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deep excitatory loop: |
-no purkinje fibers -the mossy fibers and climbing fivers excite the deep cerebellar nuclei |
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inhibitory loop: |
mossy fibers excite parallel fibers which excite purkinje fibers climbing fibers excite purkinje fibers -purkinje fibers inhibit deep cerebellar nuclei |
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ataxia |
jerky, imprecise movements |
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spontaneous nystagmus |
eyes drift from target and jump back with corrective saccade |
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dysdiadochokinesia |
difficulty performing rapid, alternating movements |
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dysmetria |
-undershooting (hypometria) or overshooting (hypermetria) with targeted movements |
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wide-based gait |
- a symptom of difficulty controlling walking movements - |
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where do climbing fibers get their input? |
-the inferior olive |
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where do mossy fibers get their input? |
pontine nuclei (cerebral cortex), spinal cord, vestibular system |
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what peduncles are used for output by the spinocerebellar tract? |
superior peduncle |
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what peduncles are used for output by the cerebrocerebellar tract? |
superior peduncle |
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what peduncles are used for output by the vestibulospinal tract? |
inferior peduncle |
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what does the cerebrocerebellum do? |
-modifying voluntary movements -planning and executing movements -most involved in highty skilled movements |
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what does the spinocerebellum do? |
-modifies spinal cord and brain stem reflexes -supports voluntary movements -involved in execution of voluntary movements |
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what does the vestibulocerebellum do? |
-modifies vestibular reflexes -movements underlying postural control and balance -saccades -composed of the flocculus and the nodulus |
