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30 Cards in this Set
- Front
- Back
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What is the overall function of the cerebellum?
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influences the timing and force of contractions of voluntary muscles
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What is the afferent tract associated withteh flocculonodular lobe?
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vestibulocerebellum
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What is the afferent tract associated with the anterior lobe?
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spinocerebellum
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What is the afferent tract associated with the posterior lobe?
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cerebrocerebellum
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The inferior cerebellar peduncle connects to? consist of what areas and fibers?
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- connects ot the medulla
- input fibers - laterally is the restiform body and medially the juxtarestiform body |
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The middle cerebellar peduncle connects to? fibers?
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- basilar pons
-input |
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The superior cerebellar peduncle connects to? fibers?
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- midbrain
-output |
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What are the 3 major parts of the cerebellum?
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1. cortex
2. internal white matter 3. cerebellar nuclei |
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What are the 3 parts of the cerebellar cortex?
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1. molecular layer
2. purkinje cell layer 3. granular layer |
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Describe the molecular layer
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-comprimsed mainly of purkinje dendrites
- receives input from the climbing fibers and granule fibers that synapse on the purkinje dendrites |
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Describe the purkinje cell layer of the cerebellar cortex
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- one layer thick
- medial layer |
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Describe the purkinje cells
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- only output of cortex and inhibit the cerebellar nuclei
- sends its dendrites to the molecular layer - axons go to the DSCT - receives input from the mossy fibers/olive (strong) and granule (weak) |
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Describe the granule cells
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- receive input from mossy fibers
- only excitatory neurons within the cortex - synapse on dendrites of purkinje via parallel fibers |
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Describe the granular cell layer
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- inner most layer
- densly packed, only spaces are synapses - dense innervation |
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The inferior olive nuclei and its afferens are required for?
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- acquistion of a new skill
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What are the 3 cerebellar nuclei?
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1. fastigial
2. interposed 3. dentate |
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Purkinje neurons from which lobe(s) go to the fastigial nuclei?
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vermis and flocculonodular
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Interposed nuclei receive purkinje neurons from which lobe(s)
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intermediate parts of the hemisphere
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How are the lobes and nuclei arranged?
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- somatotopically (medial= efferents go to the head/trunk)
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Describe the purpose, and major input/output of the posterior lobe
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- learning/storage of highly skilled, rapid movements
- input from cortex -output to motor cortex for skilled movements |
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Describe the purkinje cell layer of the cerebellar cortex
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- one layer thick
- medial layer |
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Describe the purkinje cells
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- only output of cortex and inhibit the cerebellar nuclei
- sends its dendrites to the molecular layer - axons go to the DSCT - receives input from the mossy fibers/olive (strong) and granule (weak) |
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Describe the granule cells
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- receive input from mossy fibers
- only excitatory neurons within the cortex - synapse on dendrites of purkinje via parallel fibers |
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Describe the granular cell layer
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- inner most layer
- densly packed, only spaces are synapses - dense innervation |
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The inferior olive nuclei and its afferens are required for?
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- acquistion of a new skill
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What are the 3 cerebellar nuclei?
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1. fastigial
2. interposed 3. dentate |
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Purkinje neurons from which lobe(s) go to the fastigial nuclei?
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vermis and flocculonodular
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Interposed nuclei receive purkinje neurons from which lobe(s)
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intermediate parts of the hemisphere
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How are the lobes and nuclei arranged?
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- somatotopically (medial= efferents go to the head/trunk)
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Describe the purpose, and major input/output of the posterior lobe
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- learning/storage of highly skilled, rapid movements
- input from cortex -output to motor cortex for skilled movements |
