cerebellum (dr. driscoll) Flashcards
what are the three cortico- tracks and where do they terminate
corticospinal: motor cortex to ventral horn of spinal chord
corticobulbar: motor cortex to inferior olive
corticopontine: motor cortex to pontine nuclei/cells
what cerebellar peduncle does the posterior spinocerebellar tract go through
inferior cerebellar peduncle
what peduncle does the olivocerebellar tract go through
inferior cerebellar peduncle
what peduncle do the mossy fibers come from
middle cerebellar peduncle
what peduncle does the pontocerebellar tract go through
middle cerebellar peduncle
the mossy fibers are (excitatory/inhibitory)
weakly excitatory
the climbing fibers are (excitatory/inhibitory)
STRONGLY excitatory
the olivocerebellar tract projects to/synapses in the BLANK and BLANK
deep cerebellar nuclei and cerebellar cortex
the pontocerebellar tract/mossy fibers project to/synapses in the BLANK and BLANK
deep cerebellar nuclei and cerebellar cortex
the posterior spinocerebellar tract terminates/synapses in the BLANK
cerebellar cortex
where does excitatory input to the pirkinge cells in cerebellar cortex come from
mossy fibers and climbing fibers
where does the axon of purkinge cells project to
deep cerebellar nuclei
the cerebellodentothalamic tract goes from the BLANK through the BLANK and projects to the BLANK
deep cerebellar nuclei through the superior cerebellar peduncle and projects to the VL of thalamus
the cerebellodentorubral tract goes from the BLANK through the BLANK and projects to the BLANK
deep cerebellar nuclei through the superior cerebellar peduncle and projects to the red nucleus
purkinje cells are excitatory/inhibitory
inhibitory (GABA)
4 pillars/functions of cerebellum
- synergy
- comparison
- prediction
- control/brakes
synergy (cerebellum) function/meaning
rapid processing of info + changes in speach/movement
comparison (cerebellum) function/meaning
rapid correction
prediction (cerebellum) function/meaning
rapid prediction + anticipation of whats going to happen
control/brakes (cerebellum) function/meaning
being able to stop movement + speech when needed/appropriate
what makes up the archicerebellum
floculonodular lobe (floculus + nodulus)
what makes up the paleocerebellum
anterior lobe and vermis
what makes up the neocerebellum
posterior lobe
what is the function of the archicerebellum
ballance and positioning, works w/vestibular system (vestibular nuclei in brainstem and semicircular canals)
paleocerebellum funcion
muscle tone (specifically muscles of trunk)
neocerebellum function
skilled voluntary movements
most damage to cerebellum results in ipsi/contralateral damage
ipsilateral damage (bc crosses once on way into cerebellum and once on way out, cancel eachother out)
the inferior cerebellar peduncle contains the BLANK and BLANK, info from BLANK, and info from BLANK
posterior spinocerebellar tract, info from reticular formation (alternes), info from vestibular nuclei (balance), olivocerebellar tract (climbing fibers, strongly excitatory)
the middle cerebellar peduncle contains BLANK tract
pontocerebellar tract (mossy fibers, weakly excitatory)
the superior cerebellar peduncle contains BLANK and BLANK tracts
cerebelodentatothelamic tract and cerebelodentatorubral tract
(output from deep cerebellar nuclei)
climbing fibers do what to purkinge cells
wrap around purkinge dendrites and are STRONGLY excitatory
mossy fibers do what in cerebellar cortex
excited granular cells in granular cell layer that then send branching axons (paralell fibers) up to purkinge cell layer where they WEEKLY excite the purkinge dendrites
basket cells do what in the cerebellar cortex
wrap around purkinge cell bodies and INHIBIT purkinge cells
damage to archicerebellum results in BLANK
balance problems
damage to the anterior cerebellum/paleocerebellum results in BLANK
posture distubances
damage to neocerebellum results in BLANK or BLANK, BLANK, and/or BLANK + BLANK
distonia or hypotonia, dysarthria, asynergia + dysynergia
distonia/hypotonia definition
too little muscle tone (floppy), to much muscle tone (rigidity)
intention tremor definition
tremor during purposeful action (reaching for something, looking in specific direction)
asynergia + dysynergia definition
lack of rebound control
includes:
- dismetria
- decomposition of movement
- dysdiadochokinesis
dismetria dfinition
reaching to far for things/inability to stop actions
dysdiadochokinesis definition
inability to perform rapid, alternating movements
