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19 Cards in this Set
- Front
- Back
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Blood supply to the cerebellum |
Superior cerebellar artery - basilar artery Inferior anterior cerebellar artery - basilar artery Inferior posterior cerebellar artery - vertebral artery |
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Superior peduncle connects to the... |
Midbrain - dentothalamic tract - dentorubral tract
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Middle peduncle connects to the... |
Pons - pontocerebellar tract |
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Inferior peduncle connects to the... |
Medulla |
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Nuclei in the cerebellum |
Dentate nuceli Interposed nuclei (globose and emboliform) Fastigial nuclei |
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Molecular layer is composed of? |
parallel axons and dendrites Afferent = parallel fibres of granule cell axons Efferent = purkinje cell dendrites |
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Purkinje cell layer is composed of.... |
Thin row of large cells 15 000 000 cells Afferent = parallel fibres of granule cells and climbing fibres Efferent = deep cortical nuclei |
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Granule cell layer is comprised of... |
closely packed granule cells 50 000 000 000 cells Afferent = mossy fibres Efferent = purkinje cell dendrites |
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Feedback mechanism |
- Every motor action has a sensory consequence that reflects the motor action - Sensory feedback is a readout or a self-image of the motor output that is used by the motor cortex as a measure of actual performance of its motor action - Monitors whether motor actions are progressing in accordance with the motor plan
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Feed-forward Mechanism |
Depends on your experience - your cerebellum is able to predict the outcome of movements and modulates movement before an error can occur
Coordinates the timing and strength of muscular contractions |
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Motor command via |
Pyramidal and Extrapyramidal Pathways |
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Cerebellum |
- Acts as a comparator and sensory feedback - Detects disparity between motor patterns - Involved in the process of error correction of ongoing movements - coordinator of all body movements - lesion of the cerebellum leads to a lack of coordinated movements |
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Proprioceptive information comes from |
Muscle spindles = muscle stretch Golgi tendons = muscle contraction Ruffini corpuscles = joint position |
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Lesion - lack of propriception |
- Patient lacks proprioceptive information - Patient cannot perceive position or movement of legs and staggers - Patient uses vision to monitor movement to compensate for lack of proprioception |
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Alcohol and the Cerebellum |
Prone to adverse effects of alcohol - ataxic gait - involuntary and uncoordinated eye movement - slurry speech - loss of ability to show skilled movement |
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Vestibulocerebellum - composed of...? - receives projections from? - sends feedback to? - function..... |
OLDEST PART OF THE CEREBELLUM - flocculonodular lobe - vestibular nuclei and vestibular nerve - vestibular nuclei to the fastigial nuclei - keeps body in centre of gravity and stabilises head
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Spinocerebellum - composed of...? - receives projections from? - sends feedback to? - function..... |
OLD PART OF THE CEREBELLUM - anterior lobe, vermis and intermediate (paravermal) hemisphere - ipsilateral spinal cord - fastigial and interposed nuclei - regulates muscle tone, posture and balance |
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Cerebrocerebellum / Pontocerebellum - composed of...? - receives projections from? - sends projections to? - function..... |
NEW PART OF THE CEREBELLUM - lateral hemispheres - motor cortex - dentate nucleus via the thalamus and red nucleus - coordinates fast alternating movements by planning movements with regard to direction, timing and force - good at modulating digits |
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Lesions 1. Spinocerebellar and Vesitbulospinal 2. Cerebrocerebellar / Pontocerebellar |
1 = truncal ataxia 2 = limb ataxia |
