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Motor System - Cerebellum - Coggle Diagram
Motor System - Cerebellum
Functions
1 Coordination of movement
Maintenance of equlibrium
Regulation of muscle tone for postural control
Learning new skills and memory
Detects errors between intended and actual movements
Composition
50% of all brain neurons, 10% of brain volume
Cortex
Grey matter
Deep
White matter
Deep cerebellar nuclei
Components
Cerebellar cortex
Posterior lobe : Cerebrocerebellum
Anterior lobe: Spinocerebellum
Flocculonodular lobe: Vestibulocerebellum
Deep cerebellar nuclei
Dentate
Interposed
Globose
Emboliform
Fastigial
Cerebellar peduncles
Superior
Middle
Inferior
Inputs / Outputs
Inputs
Frontal Lobe
Primary motor cortex
Premotor cortex
Parietal Lobe
Primary somatosensory cortex
Secondary somatosensory cortex
Spinal Cord
Vestibular nuclei of braintem
Outputs
Nuclei
VL complex Thalamus
Upper motor neurons of cortex
Via superior cerebellar peduncle
Functional Divisions
Spinocerebellum
Function
Compares
motor info from Motor Cortex with sensory info from Muscle Spindels
Corrects
motor output
Input
Sensory / somatosensory from brainstem/
spinal cord
Motor infor from motor cortex
Cerebrocerebellum
Inputs
Cerebral cortex
Function
Motor planning
Coordination
Regulation of highly skilled movements
Vestibulocerebellum
Input
Vestibular nuclei in brainstem
Function
Regulation of movements underlying
posture and equilibrium
Purkinje cell inputs
Mossy Fibres
Input
Spinal cord + brainstem
Climbing fibres
Input
Inferior olive (Cortex → Red nucleus → Inferior olive)
Cells of Cerebellum
Purkinje
GABAergic
Funtion
Output to Deep Cerebellar Nuclei
Input
Climbing fibres
Parallel fibres of granule cells
Granule
Glutamatergic
Function
Influence Purkinje cells
Input
Mossy firbes
Stellate
Function
Local inhibition
Basket
Lateral inhibition of Purkinje to focus spatial activity
Golgi
Inhibitory interneurons
Motor Learning
Function
Disinhibition
of deep cerebellar nuclei
Process
Climbing fibres relay message of error to Purkinje
Produces long term reuction in Prukinje repsonse to
Mossy fibre
and
Parellel fibre input
Results in disinhibition of nuclei
Increased output
of cerebellum
Cellular process
