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Cerebellum
Fichas del conjunto (28)
- 1What is the overall function of the cerebellum?to reduce movement error through detecting a difference between intended movement and actual movement
- regulate posture
- coordinate eye movement - 2When can these corrections occur?on line (during execution) or in stored corrections through sensorimotor learning
- 3How does the cerebellum regulate movement?No direct connections to motor targets. There is an indirect regulation of movement/posture and it adjusts output of major descending tracts
- 4Simple anatomy of the cerebellumMeans little brain
- 10% of brain volume and it has more than 50% of the neurons - 5Rules of 3 for the cerebellum- 3 lobes
- 3 routes in and out in peduncles
- 3 layers of cerebral cortex
- 3 functional divisions
- 3 main inputs
- 3 main outputs via 3 (paired) deep nuclei - 6Input to output ratio in the peduncles40:1
- 7What is the anterior lobe responsible for ? posterior? flocculonodular?Unconscious proprioception
fine motor control
balance, equilibrium and muscle tone - 8Grey matter of the cerebellum? White mattercerebellar cortex. Arbour vitae which is the afferent and efferent fibers running to and from cerebellar cortex
- 9The regions of the cerebellum are named for their source of afference- vestibulocerebellum ( lat)
- cerebrocerebellum (ponto - inf)
- spinocerebellum (med) - 10Input and output and functions of the vestibulocerebellumInput - vestibular nuclei in brainstem
Output - LMN via vestibular nuclei in brainstem
Function: balance, control of head and eye movements - 11Input and output and functions of the SpinocerebellumInput: somatosensory of spinal cord
Output: cerebral cortex and brainstem
Function: control of muscle tone, fine tuning of the body/limb movement - 12Input and output and functions of the CerebrocerebellumInput: cerebral cortex via pontine receptors
Output: back to motor/premotor cortex via thalamus
Function: modification of central demands - 13What kind of representation of the body ins the cerebellum concerned with?ipsilateral representation
- 14Cerebellar Inputs and output summaries LIST AND PATHWAYSyeah bitch
- 15PATHWAYS of the tracts also try to learn themy tho
- 16What are some clinical symptoms of cerebellar dysfucntions?damage to or loss of cerebellar tissue does not lead to paralysis rather it leads to adverse deficits in control and coordination
- 17What is ataxia?lack of coordination/clumsiness
- decomposition of movement - 18What is dysmetria?- movements off target
- Hypermetric - overshoot
- Hypometric - undershoot - 19What is apparent intention (action) tremor?fine, rhythmic purposeless movements
- 20What is Dysdiadochokinesia?- inability to perform rhythmic movements
- results from inappropriate timing of muscle activation - 21What is Nystagmus?Impairments of eye control
- 22What is Hypotonia?- decrease in resistance offered in joints to passive movement
- 23Thach, Godkin and Keating in 1982 about cerebellar contribution to sensory motor learning- adaptations in apparent visual field
- dart throwing through prism specs
- visual moved 15* to the right - 24What did they find was the solutions for error correction?1. kinesthetic adaptation
2. visual recalibration - 25Kinesthetic adaptation in error correction- aiming left
- continual comparison of perceived vs actual until you eventually eliminate error - 26Visual recalibration in error correction- deviate eyes in direct opposition to effect of prism
- 27Differences between normal subjects and cerebellar patientsNormal subjects quickly adapted to altered visual and there was no compensation amongst the cerebellar patients
- 28This study confirms the role of the cerebellum in?1. regulating eye movements through no visual recalibration
2. sensorimotor learning where it is unable to correct for errors (comparator deficit)
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- final Motor Control Fichas sobre Cerebellum, creado por Kevin Floyd el 10/12/2021.
- Creado por
- Kevin Floyd
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