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Cerebellum Flashcards

1
Q

The cerebellum does what 3 basic functions?

A
  1. sequencing complex movements
  2. postural adjustments
  3. modifying motor programs
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2
Q

What are the 3 lobes of the cerebellum?

A
  1. anterior - mm tone
  2. posterior - coordinates movement
  3. flocculonodular - balance and eye movements
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3
Q

If pressure increases on the cerebellar tonsils, what can happen?

A

pinch medulla

- leading to cardio/respiratory consequences

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4
Q

what is the output apparatus of the cerebellum?

A

Deep cerebellar nuclei

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5
Q

what is the acronym for cerebellar nuclei from LATERAL to MEDIAL?

A

Dont eat greasy food

  • Dentate
  • Eboliform
  • Globose
  • Fastigial

Eboliform and Globose are both in Interposed Nucleus

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6
Q

Acronym for layers of cerebellar cortex. From LATERAL to MEDIAL

A

My Personal Garden

  • Molecular
  • Purkinje
  • Granular
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7
Q

What occurs in Purkinje cell layer?

A
  • forms output of cerebellar cortex

- INHIBIT deep cerebellar nuclei

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8
Q

what occurs in granular cell layer?

A
  • granular cells receive input from Mossy fibers

- which then synapse on pukinje cells

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9
Q

Does cerebellum analyze ipsi or contra info?

A

Ipsi only

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10
Q

What do purkinje cells do?

A

long term inhibition of deep cerebellar nuclei

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11
Q

What are the two afferent fibers called?

A
  • Inferior Olivary fibers - Climbing

- Mossy fibers

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12
Q

Are they both excitatory or inhibitory?

A

Both excitatory

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13
Q

What do Mossy fibers do?

A

One axon has excitatory influence MANY purkinje cells

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14
Q

What do (olivocerebellar) climbing fibers do?

A

One axon has powerful excitatory input on Purkinje cells

  • which in turn will INHIBIT DCN
  • allows system to adjust instantaneously if something perturbs planned movement
  • fires less with learning
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15
Q

What are the 3 cerebellar peduncles? and what are there efferent/afferent pathways?

A
  • Superior - efferent and some afferent
  • Middle - afferent
  • Inferior - afferent and some efferent
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16
Q

what 3 pathways are in superior?

A
  1. Dentatorubrothalamic

2. ventral and rostral spinocerebellar

17
Q

What does the Dentatorubrothalamic pathway do?

A
  • efferent

- learned motor behavior

18
Q

What occurs in SCP?

A
  • crossing

- pathway crosses twice- once at segmental level & then through SCP to travel ipsilaterally to Cerebellum

19
Q

What fibers run in middle cerebellar peduncle?

Where does it receive info?

A
  • afferent
  • Pontocerebellar
  • from all parts of cortex
20
Q

What fibers and pathways are found in inferior peduncle?

A 
-afferent and some efferent
Dorsal & cuneocerebellar pathways
Olivocereblellar
Trigeminocerebelzar
Vestibulocerebellar
Fastigiovestibular
21
Q

What do cuneocerebellar pathways do?

A

carry specific joint and mm info encoded by GTO’s, mm spindles, joint capsule receptors

22
Q

What do Olvocerebellar pathways do?

A

from olivary complex

Give rise to climbing fibers

23
Q

What does trigeminocerebellar pathway do?

A

carry info from face, jaw, eye mm

24
Q

What does vestibulocerebellar pathway do?

A

axons from vestibular nuclei as well as direct fibers form vestibular apparatus

25
what does fastigiovestibular pathway do?
carries an efferent pathway from fastigial and interposed nucleus to vestibular nuclei
26
what are the 3 divisions of cerebellum?
1. vestibulocerebellum 2. spinocerebellum 3. cerebrocerebellum
27
what does vestibulocerebellum do? and what Lobe is it found in?
Controls postural tone & balance -also controls extra ocular eye movements, Flocculododular lobe
28
Where do efferent go through for Vestibulocerebellum?
inf. cerebellar peduncle
29
Where does Vestibulocerebellum get its info from and what does it do with it?
Gets it from vestibular nucleus and sends it back to influence vestibular function and reticulospinal pathways
30
Where is spinocerebellum located (lobe) and what does it do?
Vermis and paravermal zones - anterior lobe - Muscle tone - also controls limb movement for error correction resulting in coordinated movements
31
What info comes from the spinal cord and into the Spinocerebellum?
auditory, visual, vestibular, trigeminal, motor cortex
32
what 2 tracts are found in the spinocerebellum? are they efferent or afferent?
efferent DSCT VSCT Dorsal and ventral spinocerebellar tract
33
What does the cerebrocerebellum do and what lobe is it found in?
Coordination of movement - posterior - also memory of movements
34
What hemispheres is cerebrocerebellum found in?
Lateral
35
Where does cerebrocerebellum send its efferent info to? and through what tract?
motor and premotor cortex | -dentatorubrothalamic pathway

Neuro final (8 decks)

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