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Neuro final > Cerebellum > Flashcards

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
Q

what does fastigiovestibular pathway do?

A

carries an efferent pathway from fastigial and interposed nucleus to vestibular nuclei

26
Q

what are the 3 divisions of cerebellum?

A
  1. vestibulocerebellum
  2. spinocerebellum
  3. cerebrocerebellum
27
Q

what does vestibulocerebellum do? and what Lobe is it found in?

A

Controls postural tone & balance
-also controls extra ocular eye movements,
Flocculododular lobe

28
Q

Where do efferent go through for Vestibulocerebellum?

A

inf. cerebellar peduncle

29
Q

Where does Vestibulocerebellum get its info from and what does it do with it?

A

Gets it from vestibular nucleus and sends it back to influence vestibular function and reticulospinal pathways

30
Q

Where is spinocerebellum located (lobe) and what does it do?

A

Vermis and paravermal zones - anterior lobe

  • Muscle tone
  • also controls limb movement for error correction resulting in coordinated movements
31
Q

What info comes from the spinal cord and into the Spinocerebellum?

A

auditory, visual, vestibular, trigeminal, motor cortex

32
Q

what 2 tracts are found in the spinocerebellum? are they efferent or afferent?

A

efferent
DSCT
VSCT
Dorsal and ventral spinocerebellar tract

33
Q

What does the cerebrocerebellum do and what lobe is it found in?

A

Coordination of movement

  • posterior
  • also memory of movements
34
Q

What hemispheres is cerebrocerebellum found in?

A

Lateral

35
Q

Where does cerebrocerebellum send its efferent info to? and through what tract?

A

motor and premotor cortex

-dentatorubrothalamic pathway

Neuro final (8 decks)

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