What is the function of the cerebrocerebellum?
it modulates cortices involved in movement
The spinocerebellum contains the _____.
vermis and paravermis
What is the function of the paravermal zone?
stretch and withdrawl reflexes
Name the 4 deep cerebellar nuclei.
- Dentate nucleu
- and emboliform which together make the interposed nucleus
- Fastigial Nuclei
Small lesions of the cerebellum have _____ effects.
What is the function of the interposed nucleus?
it fine tunes movements of the limbs
Lateral cerebellar lesions impair _____.
the ipsilateral limb
What are the 3 layers of the cerebellar cortex?
- molecular layer -->
- Purkinje layer -->
- internal granular layer --> (white matter --> deep cerebellar nuclei)
Name the 3 deep cerebellar nuclei (principal outputs from the cerebellum).
- dentate nucleus (most lateral)
- interposed nucleus
- fastigial nucleus (most medial)
This zone of the cerebellum modulates cortices involved in movement.
Name the cerebellar functional zone: vestibular nuclei
the vestibulocerebellum pathway
Parallel fibers from granule cells converge on _____.
The granule cells relay the mossy fiber info thru the _____ to the _____.
parallel fibers --> Purkinje cells
What is the function of the dentate nucleus?
planning, initiation and coordination of voluntary movements
What is the function of the fastigial nucleus?
control of axial musculature, posture, balance and integration of head and eye movements
What are the 3 lobes of the cerebellum?
- the floculonodular lobe
- the anterior lobe
- the posterior lobe
What is the output of the cerebrocerebellum pathway?
the contralateral VA/VL thalamus (and red nucleus)
This zone of the cerebellum has control of axial skeleton and vestibular control (balance, eye movements).
Inhibitory interneurons connecting the neighboring Purkinje cells facilitates _____.
What is the output of the spinocerebellum vermis pathway?
fastigial nucleus --> medial decending tracts
How many parallel fibers contact an individual Purkinje cell?
_____ cerebellar lesions impair the ipsilateral limb.
What is the Purkinje cell response to excitation by a granule cell?
a simple spike
Climbing fibers have a _____ excitation than the mossy fibers, and the Purkinje cells respond with a ______.
stronger --> complex spike
Name the cerebellar functional zone: fastigial nucleus --> medial decending tracts
spinocerebellum vermis pathway
Name the cerebellar functional zone: the lateral decending tracts and RED NUCLEUS
the spinocerebellum paravermis pathway
What is the function of the flocculonodular lobe?
- axial control and balance
- eye movement
- the vestibuloocular reflex
- vestibule-colic reflex
- vestibule-spinal reflex
What are the inputs to the cerebellum?
- contralateral cortex --> middle cerebellar peduncle --> cerebellum
- ipsilateral proprioceptive info from spinal cord --> inferior cerebellar peduncle --> mossy fibers --> cerebellum as a copy of the reflex input
- contralateral proprioceptive info from spinal cord --> inferior olivary nucleus (ION) --> climbing fibers --> cerebellum as an error signal of unexpected response
Cerebellar defects are ALWAYS _____.
ipsilateral (they're either uncrossed or cross twice)
Climbing fibers innervate which functional zones of the cerebellum?
all 3: the vestibule, spino, and cerebrocerebellum