Cerebellar function Flashcards
What are the functions of the cerebellum? (4)
a. coordination of motor acts, planning sequential movements
b. regulation of posture
c. control of muscle tone
d. motor learning
How does the cerebellum accomplish motor function?
Compensates for errors by comparing intention with performance
How does the cerebellum ‘know” intentions?
Since information about planes for movement sent to the cerebellum from the cortex
What are the three cerebellar lobes?
Anterior
Posterior
Flocculonodular
What is the function of the flocculonodular lobe?
Works with the vestibular system in controlling equilibrium
What is the longitudinal division of the anterior and posterior lobes?
Vermis
What are the two parts of the cerebellar hemispheres?
Paravermal
Lateral zone
The cerebellar hemispheres and the deep cerebellar nuclei are involved in the control of movement of the ipsilateral or contralateral parts of the body?
Ipsilateral
What are the two feedback tracts to the cerebellum?
Anterior spinothalamic
Rostrospinocerebellar
The high fidelity tracts carry what information to the cerebellum?
Proprioception
What is the role of the internal feedback tracts to the cerebellum?
Monitor activity of spinal interneurons and of descending motor signals from the cerebral cortex and brainstem
What is the role of the cerebellum in the cognitive part of speech?
Word associations
What are the cerebellar nuclei from medial to lateral?
Fastigial
Globose
Emboliform
Dentate
What are the three functional divisions of the cerebellum?
Spinocerebellum
Cerebrocerebellum
Vestibulocerebellum
What are the three major inputs into the cerebellum?
- Mossy fibers
- Climbing fibers
- Non-laminar afferents
Where do the mossy fibers come from?
Neurons in the spinal cord and brainstem
Where do the climbing fibers come from?
Inferior olive
What are the cells in the cerebellum that contact the climbing fibers?
Purkinje cells
What are the five main types of cells in the cerebellum?
Purkinje Granule Golgi Stellate Basket
What is the only cell to project out of the cerebellar cortex?
Purkinje
What is the function of the granule cells in the cerebellum?
Excitatory cell
What is the function of the golgi cell in the cerebellum?
affect dendritic input to Purkinje cells by inhibiting granule cells
What is the function of the stellate cells in the cerebellum?
affect dendritic integration of Purkinje cells through inhibitory synapses onto dendritic tree
What is the function of the basket cells in the cerebellum?
makes inhibitory synapses near initial segment of Purkinje cell axon