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28 Cards in this Set
- Front
- Back
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What are the divisions of the cerebellum?
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Divided into lobes
Lobes divided into smaller divisions |
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What are the divisions of the lobes?
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Lobules and a vermis
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Vermis
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Long strip in middle on either side (2 cerebellar hemispheres)
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How many cerebellar lobes are there?
What are they? |
3 lobes within each hemisphere
Anterior, middle (posterior) and flocculo-nodular |
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What is the function of the anterior cerebellar?
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Regulates posture
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What is the function of the middle cerebellar lobe?
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Coordination of discreet movement
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What is the function of the flocculo-nodular lobe?
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mediates equilibrium and balance
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What are the 3 peduncles of the cerebellum?
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Superior cerebellar peduncle
Middle cerebellar peduncle Inferior cerebellar peduncle |
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Inferior cerebellar peduncle
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"Where am I in space?"
Gives feedback to cerebellum Info from spinal cord, medulla, 8th cranial nerve Ascending to cerebellum (sensory) Output to cortex |
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Middle cerebellar peduncle
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"Where my limbs should be in space?"
Gives info to cerebellum Info from motor cortex, medulla, 8th cranial nerve, pontine nuclei = corticopontinecerebellar fibers |
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Superior cerebellar peduncle
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"Final reporting back to thalamus"
Major outflow FROM cerebellum To thalamus and ventral lateral nucleus From thalamus to sensory strip (cortex) |
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How is the cerebellum a continuous feedback loop?
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Dampens movement, if too much
Increases movement, if not enough |
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What are the main functions of the servosystem?
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Stability, balance, posture
Smooth movement is the final result ("synergistic coordination of movements") |
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What is the term for lack of coordinated movement?
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asynergy
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What is the primary sign of a cerebellar lesion?
(give the technical term and what it affects) |
ataxia
affects gait |
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What determines the symptoms of ataxia?
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The lesion location
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What kinds of symptoms do you get with a flocculo-nodular lobe lesion?
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Affects trunk, gait, posture, balance
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What kinds of symptoms do you get with an anterior lobe lesion?
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"Alcoholic gait", side-to-side lack of balance
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What are effects of a neocerebellar (middle lobe) lesion?
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Intention tremor
Dysdiadochokinesis Dysmetria Hypotonia Rebound Nystagmus Dysarthria |
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Intention tremor
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Only happens when reaching/talking with intention
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Dysdiadochokinesis
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Disorganized, uncoordinated, rapid alternating movement
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Dysmetria
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Overshoot/undershoot, estimating distances
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Hypotonia
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Not enough muscle tone
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Rebound
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Failure to adjust when pulling/pushing against opposing force
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Nystagmus
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Oscillatory eye movements
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Dysarthria
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Speech articulatory disorder from brain damage
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What are the overall functions of the cerebellum?
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Coordination of voluntary movement
Balance and equilibrium Some memory for motor reflex motor acts |
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What are some observed problems with the cerebellum?
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Loss of ability to coordinate fine movements
Loss of ability to walk Tremors Inability to reach out and grab objects Dizziness - vertigo Slurred speech (scanning speech) Inability to make rapid movements |
