Role of cerebellum and basal ganglia in planning and fine control of movement Flashcards

1
Q

Which 4 types of body orientation are controlled by the cerebellum, which overall allows fine control/coordination of movement?

A

Movement
Posture
Motor learning
Synergy

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2
Q

Define synergy of movement?

A

Rate/range/force/direction of movement

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3
Q

What are the 3 main divisions of the cerebellum?

A

Vestibulocerebellum

Spinocerebellum

Pontocerebellum

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4
Q

What is the other name for the vestibulocerebellum, and which 2 individual cerberllar structures make up the vestibulocerebellum division?

A

Flocculonodular lobe

Consists of nodule and flocculus

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5
Q

Define vestibular input, and how where are vestibular receptors located?

A

Sensation of any change in position, direction, or movement of the head

Vestibular receptors are located in inner ear

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6
Q

What are the 2 effects of the vestibulocerebellum, in terms of controlling movement?

A

Controls eye movement

Controls balance

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7
Q

In the vestiulocerebellum division, which ascending tract is vestibular input transmittted in by first-order sensory neurons from the inner ear vestibular receptors?

A

Vestibulocerebellar tract

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8
Q

In the vestibulocerebellum division, where in the brainstem do most first-order sensory neurons synpase with second-order neurons?

A

Medial or inferior vestibular nuclei, which are located in the brainstem

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9
Q

In the vestibulocerebellum division, how is vestibular input transmitted from the medial/inferior vestibular nuclei in the brainstem to the cerebellar cortex?

A

Vestibular input continues to ascend from vestibular nuclei, through inferior cerebellar peduncles into cerebellar cortex

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10
Q

In the vestibulocerebellum division, do all vestibular inputs ascend to the vestibular nuclei, during transmission to the cerebellar cortex?

A

No, some first-order neurons ascend directly through inferior cerebellar peduncle to cerebellar cortex

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11
Q

Which 2 individual cerebellar structures make up the spinocerebellum?

A

Vermis (unpaired, middle region of cerebellum that connects both hemispheres)

Intermediate hemispheres

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12
Q

Which 2 nuclei (cluster of neurons) are associated with the spinocerebellum?

A

Interposed nuclei

Fastigial nuclei

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13
Q

What are the 2 effects of spinocerebellum division, in terms of controlling movement?

A

Recieves spinal cord input to:

Control synergy of movement

Convey proprioceptive info (ability to sense movement, action, and locate body parts), touch, pressure

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14
Q

What are the 2 ascending tracts to the spinocerebellum division?

A

Posterior/dorsal spinocerebellar tract

Anterior/ventral spinocerebellar tract

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15
Q

Which spinal segmental levels detect spinal cord input that ascends through the posterior/dorsal spinocerebellar tract, and which body regions are supplied by the output?

A

Segments above L3 level

Trunk, lower limbs

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16
Q

Which spinal segmental levels detect spinal cord input that ascends through the anterior/ventral spinocerebellar tract, and which body regions are supplied by the output?

A

Segments below L3 level to coccygeal

Lower limbs

17
Q

In the spinocerebellar tracts, which 3 structures detect proprioceptive, touch and pressure input?

A

Muscle spindles

golgi tendon organ

pressure receptors

18
Q

In the spinocerebellar tracts, where in the spinal cord do first-order sensory neurons transmit proprioceptive, touch and pressure input to?

A

Input carried past dorsal root ganglion, into dorsal horn/posterior grey column

First synaptic site is in the posterior grey column

19
Q

In the spinocerebellar tracts, which specific second-order neurons do first-order sensory neurons synapse with in the posterior grey horn?

A

First-order neurons synapse with second-order neurons of Clark’s nucleus

Clark’s nucleus/Column of Clarke: Column of interneurons found within rex lamina (7), which have nuclei ranging from C8-L3 levels

20
Q

Where do the axons of the second-order neurons from Clarke’s nucleus travel to from the posterior grey column before starting to ascend, in the 2 spinocerebellar tracts?

A

Posterior/dorsal tract: Axons enter lateral white column and move ipsilaterally (affects same side of body) towards posterior region

Anterior/ventral tract: Axons move contralaterally (to opposite side of body) across midline of spinal cord to lateral white column, which is on opposite side from where neurons entered spinal cord

21
Q

Does the axon of the second-order neuron from Clarke’s nucleus ascend ipsilaterally or contralaterally to the side where the input entered the spinal cord, in the posterior spinocerebellar tract?

A

Second-order neuron ascends ipsilaterally (still on same side of body)

22
Q

Does the axon of the second-order neuron from Clarke’s nucleus ascend ipsilaterally or contralaterally to the side where the input entered the spinal cord, in the anterior spinocerebellar tract?

A

Second-order neuron ascends contralaterally

23
Q

In the anterior spinocerebellar tract, which cerebellar peduncle does the axon of the second-order neuron enter to reach the ipsilateral side of the cerebellum (same side that first-order neurons entered spinal cord)?

A

Enters superior cerebellar peduncle to enter cerebellum

Crosses midline again to reach other side of cerebellum (which is on same side that first-order neurons entered spinal cord)

24
Q

In the posterior spinocerebellar tract, which cerebellar peduncle does the axon of the second-order neuron enter to reach the ipsilateral side of the cerebellum (same side that first-order neurons entered spinal cord)?

A

Enters inferior cerebellar peduncle

25
Q

Overall, do both of the spinocerebellar tracts supply the ipsilateral cerebellar cortex (on same side that first-order neurons entered spinal cord)?

A

Yes

26
Q

In the spinocerebellar tracts, where does the second-order neuron of Clarke’s nucleus synapse, after ascending to the cerebellar cortex?

A

Synapses with third-order neurons of cerebellar cortex

27
Q

Which cerebellar structure makes up the pontocerebellum/ cerebrocerebellum division, and what type of nuclei is found in this division?

A

Lateral hemispheres

Dentate nuclei (cluster of neurons with serrated/dentated edge)

28
Q

Where does the pontocerebellum/ cerebrocerebellum receive sensory input from, and what is its effect on movement?

A

Cerebral cortex

Controls planning/initiation of movement of extremities

29
Q

In the pontocerebellar tract, where do first-order neurons from the cerebral cortex synapse with second-order neurons?

A

Synapse with second-order neurons in the pontine nuclei

30
Q

In the pontocerebellar tract, how do axons of second-order neurons in the pontine nuclei reach the contralateral cerebellar cortex?

A

Axons of pontine nuclei ascend through middle cerebral peduncle to supply contralateral cerebellar cortex

31
Q

Define cerebellar peduncle?

A

Structure connecting brainstem and cerebrum to cerebellum

Superior, middle, inferior

32
Q

Define cerebellar cortex?

A

Continuous 3-layered sheet of neurons that is the outer layer of the cerebellum, that receives input from rest of body and brain regions to be integrated by the cerebellum, which sends output to rest of brain

33
Q

Where is the basal ganglia located, and what are its 4 primary associations with movement?

A

Basal ganglia: Group of subcortical nuclei located deep in core of each cerebral hemisphere

Motor control and learning, executive function, behaviours, emotions

34
Q

How does the indirect pathway of the basal ganglia inhibit undesired movement?

A

Causes inhibition of VL nucleus of the thalamus so that excitatory projections aren’t sent to the motor cortex

35
Q

How does the direct pathway of the basal ganglia promote desired movement?

A

Excitatory pathway of desired movement, as is causes inhibition of inhibitory region within thalamus, which causes disinhibition