Lecture 5- motor control (Direct and indirect activation pathways;U Flashcards

1
Q

What are the 3 stages of motor learning?

A

planning, programming, and execution

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2
Q

The corticobulbar tract is _______, whereas the corticospinal tract is ______.

A

Bilaterally; mostly contralateral

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3
Q

What is the pathway of the corticospinal tract?

A

Motor cortex –> UMN synapses with LMN; LMN sends signals down the spinal cord via spinal nerves —-> spinal nerves innervate the skeletal muscles

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4
Q

Where in the brain are the UMNs located?

A

in the motor cortex

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5
Q

Where in the brain are the LMNs located?

A

in the CNS

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6
Q

LMN axons leave the CNS through _______.

A

spinal nerves

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7
Q

The left ventral motor area is also known as

A

Broca’s area

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8
Q

The lateral corticospinal tract innervates ____

A

muscles in the limbs

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9
Q

The anterior corticospinal tract innervates _____

A

muscles of the trunk

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10
Q

In the lateral corticospinal tract, where do the UMN axons decussate?

A

at the caudal medulla or pyramids of the medulla

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11
Q

What areas of the brain does the motor impulses go through on the lateral corticospinal tract to innervate a muscle?

A

motor strip —- > UMN —> internal capsule—-> midbrain —-> pons —-> rostral medualla —- caudal medulla —-> LMN —– spinal cord

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12
Q

What is the purpose of the corticospinal tract?

A

it carries motor impulses from the pre-central gyrus to the skeletal muscles

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13
Q

What is the pathway of the anterior corticospinal tract that the motor impulses pass through?

A

motor strip –> UMN –> internal capsule —> midbrain –> pons –> rostral medulla –> LMN—> spinal cord

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14
Q

UMNs in the corticobulbar tract end in the ______

A

brainstem

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15
Q

What are the four indirect pathways of the motor cortex?

A

rubrospinal, reticulospinal, vestibulospinal, and tectospinal

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16
Q

What are general symptoms of lesions to the indirect pathway?

A

postural imbalance, increased stretch reflex, spasticity, hypertonus

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17
Q

What are general symptoms of lesions to the direct pathway?

A

loss of skilled movement, impaired deep tendon reflexes, Hypotonia, babinski sign

18
Q

How is the corticobulbar tract affected when someone has a large right MCA stroke?

A

left side of head, face, and neck are weak, issues with CN VII and XII, dysarthria, swallowology issues, and visuospatial issues

19
Q

How is the corticospinal tract affected when someone has a large right MCA stroke?

A

hemiplegia on the left side (left side of the limbs and trunk are paralyzed)

20
Q

How is the corticobulbar tract affected when someone has a small left hemisphere stroke that affects left MCA anterior ventral distribution?

A

apraxia, nonfluent aphasia, another motor speech disorder, and some weakness to CN VII and XII

21
Q

How is the corticospinal tract affected when someone has a small left hemisphere stroke that affects left MCA anterior ventral distribution?

A

weakness on the right side of the body (limbs and trunk)

22
Q

Indirect pathways affects which neurons?

A

gamma LMNs

23
Q

Direct pathways affect which neurons?

A

alpha LMNs

24
Q

LMNs are not affected by these brain regions involved in movement

A

cerebellum and basal ganglia

25
Q

Damage to what tract of the indirect pathway of the motor cortex causes spasticity?

A

left lateral medullary reticulospinal tract

26
Q

Which two tracts of the indirect pathways do not receive information from the motor cortex?

A

tectospinal and vestibulospinal

27
Q

Where does the tectospinal tract get information from?

A

visual and auditory systems

28
Q

Where does the vestibulospinal tract get information from?

A

vestibular nuclei

29
Q

Where does the rubrospinal tract start?

A

in the red nucleus of the midbrain

30
Q

Rubrospinal tract gets information from the

A

cerebellum (part of the motor circuitry

31
Q

Where does the vestibulospinal tract start? What is it responsible for?

A

the vestibular nuclei in the brainstem; innervates head and neck

32
Q

Which of the tracts of the indirect pathway are bilateral and excitatory?

A

reticulospinal tract- pontine

33
Q

Which of the tracts of the indirect pathways are bilateral and inhibitory?

A

reticulospinal tract- medullary

34
Q

What is the function of the reticulospinal tract-pontine?

A

voluntary movements

35
Q

What is the function of the reticulospinal-tract medullary?

A

reflex arcs

36
Q

Decorticate posture is a result of damage to ______

A

corticoreticular tract

37
Q

Corticobulbar tract has _____ and _____ pathways

A

direct and indirect

38
Q

Where do the corticobulbar tracts start?

A

the ventral portion of the SMA, PMA, and PMC

39
Q

Corticobulbar tract is also known as the _______

A

corticonuclear tract

40
Q

What does the primary motor cortex (B.A. 4) do?

A

innervates spinal and cranial nerves 5,7, 9-12

41
Q

What does the dorsal pre-motor area (B.A. 6) do?

A

does not affect speech; however, it’s responsible for visuomotor coordination, sensorimotor integration

42
Q

What does the ventral pre-motor area (B.A. 6) do?

A

speech planning and perception; mirror neurons for motor