Cerebellum (Exam 3) Flashcards
what cells in the cerebellum only output to the cortex and inhibit nuclei
purkinje cells
each purkinje fiber is monagamus with
one climbing fiber-
each purkinje fiber receives input from only 1 climbing fiber, but each climbing fiber contacts up to 10 purkinje fibers…
everytime a climbing fiber fires the _________ fiber fires
purkinje, its obligatory
each climbing fiber impacts…
several purkinje fibers
what do the climbing fibers do?
carry info from the cerebrum (cortex), what happened? is it what we wanted to happen?
Mossy Fibers contact….
thousands of purkinje fibers but have small influence over them bc they are contacting them via parallel fibers
what info do mossy fibers carry?
carry info from the periphery of the body in order to analyze how the movement went. how did it feel? what happened?
mossy fibers travel through what pathway
spinocerebellar pathway???
how do purkinje fibers learn how to respond to particular patterns of parallel fiber inputs
climbing fibers teach them
what lobes of the cerebellum informs us of our vestibular input and balance?
flocculonodular lobe, the vestibulocerebellum
purkinje cells output to the cerebellar nuclei is …
inhibitory
where do purkinje cells get their input?
weak input from mossy fibers via parallel cells (which are given input to give to purkinje from basket cells, and golgi cells etc.) and strong input from climbing fi bers
what part of the cerebellum handles proprioception?
vermis and paravermis/ medial hemisphere - these make up the spinocerebellum
what lobes of the cerebellum handle input from cortex for high level planning of learned skillful movement?
lateral hemisphere or the cerebrocerebellum
the dentate nuclei is housed in the_____ and projects to the________
lateral hemisphere, motor, premotor cortex
the interposed nuclei is housed in the ______ hemisphere and projects to_____
intermediate hemisphere, M1 and the Red nucleus
the fastigial nuclei is housed in the _______ and projects to the ______
vermis , vestibular nuclei and reticular nuclei
what parts of the cerebellum control extension and proximal mm important for posture and balance and controls our head and eye coordination for the VOR
the vestibulocerebellum and part of the spinocerebellum (flocculonoddular lobe and the vermis)
what area of the cerebellum primarily influences limb movement?
paravermal section (medial hemisphere) of the spinocerebellum, inputs come from the motor cortex and the SC and then output goes via the interposed nucleus through the VL/VA to M1 and the red nucleus to make adjustments (***compares command from the motor cortex with whats actually happening at the limb to make adjustments on the fly)
output from the lateral and medial hemispheres are ______ allowing them to affect which side limbs?
double crossers, cerebellum affects ipsilateral limb function
damage to vestibulocerebellum and vermis lead to what?
balance disorders, ataxia, loss of eye control
how do u diff. diagnose cerebellar ataxia?
pts will maintain full control of limbs when in supine bc they don’t have to fight gravity to work to position all the joints, have more resources to put towards their limbs
damage to paravermis (medial hemisphere) of spinocerebellum causes what?
intention tremor (disruption of accuracy of execution of movements--> reduces activity of corticospinal and rubrospinal tracts which results in reduced excitabillity of LMNs and causes hypotonia which the person then tries to correct and can't causing jerky, abnormal movement patterns)
what causes dysdiadochokinesia?
lesions to lateral hemisphere (cerebrocerebellum)- results in errors in movement and in timing
can cerebellar problems affect cognition?
yes, working memory, spatial awareness, temporal judgement, word association, silent reading, pegboard puzzle solving
as an action gets more and more routine, the cerebellum gets ______acitve
less and less active
