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Med Neuro Block 3 > Corticospinal Tract > Flashcards

Corticospinal Tract Flashcards

1
Q

Three types of movements performed by Corticospinal Tract

A

Reflexes
automatic postural adjustments
Voluntary (goal directed, internally generated, get better with practice)

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2
Q

The Corticospinal tract has an UMN that projects to:

A

Lower motor neurons in the ventral horn of ALL levels of the spinal cord

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3
Q

The Corticospinal tract UMN projects to LMN in the _____ horn in which sp cord levels

A

Ventral horn

all levels

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4
Q

What is the function of the UMN–> LMN in the corticospinal tract

A

Voluntary movement of DISTAL extremeties

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5
Q

When does the corticospinal tract decussate to the other side?

A

At the medulla/sp cd junction

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6
Q

Which three descending motor pathways project to sp cd

A 
Cortical structures (primary motor cortex, prefrontal motor and somatosensory and parietal)
Subcortical strucutes (basal ganglia, cerebellum, thalamus)
Brainstem
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7
Q

The UMN for the corticospinal tract begins in:

A

Cerebral cortex… primary motor cortex

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8
Q

What is the approximate location of cortical lesion in pt who has facial weakness?

A

within the longitudinal fissure of the lateral cortical surface

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9
Q

Blood supply for the lateral part of the cortex (face)

A

the MCA

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10
Q

What is the blood supply for the lower limbs?

A

ACA

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11
Q

The motor map of the cortex overlaps and exhibits plasticity meaning….

A

it can change with increased use or disuse of a body part (PRACTICE… you can recover use of limbs from stroke!)

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12
Q

Primary motor neurons connect to __________ that innervate a skeletal muscle via corticospinal tract

A

alpha motor neurons

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13
Q

The corticospinal tract will ________ flexors and __________ extensors

A

excite flexors

inhibit extensors

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14
Q

Four areas of cortex CST arise from

A
  1. Primary motor cortex
  2. Betz of lamina V (precnetral gyrus)
  3. Premotor cortex/Supplementary Cortex
  4. Pariatal lobe
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15
Q

Order the CST pass through from cortex

A

cortex–> corona radiata–> posterior limb of internal capsule–> middle of cerebral peduncle–> medullary pyraminds

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16
Q

CST go from Cortex –> _______–> posterior limb of internal caplse –> _________—> medullary pyramids

A

corona radiata

middle of cerebral peduncle

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17
Q

90% of the tracts will _______ at the cervicomedullary level and travel down the _______

A

decussate

Lateral corticospinal tract

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18
Q

The fibers that descend in the lateral corticospinal tract will descend in

A

lateral fasciculus to all cord levels

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19
Q

10% of the fibers will _______ at the cervicomedullary level and travel down the _______

A

stay ipsilateral

Anterior or Ventral corticospinal tract

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20
Q

Fibers that travel down the Anterior or ventral corticospinal tract decussate:

A

in the ventral white commisure to thoracic sp cd.

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21
Q

Lesions above the decussation result in _____ weakness

A

CONTRA

22
Q

Lesions below the decussation result in______weakness

A

IPSI

23
Q

The lateral wall of the third ventricle is the

A

thalamus

24
Q

What lies between the caudate and putamen then alongside the thalamus

A

Internal capsule

25
Q

which stroke would have more diffuse effects, corona radiata or the internal capsule

A

Internal capsule

26
Q

Where in the midbrain does the CST pass through

A

the middle cerebral peduncle

27
Q

What is the somatotopy of the spinal cord motor system?

A

All motor in the Ventral part of horn: trunk muscles more medial… extending out most lateral as digits and fine motor control

28
Q

What is the major pathway for voluntary movement?

A

Corticospinal tract

29
Q

As the Cerebral Crus goes into the Pons, what Neve is it close to?

A

Oculomotor Nerve III

30
Q

What nerve sits right on top of the Medullary Pyramid?

A

Hypoglossal Nerve

31
Q

What nerve lies in the Ponto/medully junction (close to start of pyramid)

A

Abducent Nerve

32
Q

After the Pyramidal decussation, the Lateral Corticospinal tract will

A

stay lateral!, and ventral stays ventral

33
Q

Weber Syndrome in the midbrain affects CN

A

III (oculomotor, vision)

34
Q

Key CN in the pons

A

VI (abducens) abducting the eye

35
Q

Medial medullary syndome in the medulla would affect CN

A

XII

36
Q

A lesion in the Posterior Limb of the internal capsule would result in

A

Contralateral hemiplegia

37
Q

A lesion in the cerebral peduncle or the Crus cerebri could rsult in which syndrome?

A

Weber Syndrome

38
Q

Symtpoms of Weber syndrome

A

Contralateral paralysis of lower face/tongue/arm/leg and Ipsilateral oculomotor palsy (eye deviates laterally, ptosis, pupil is dialatead and fixed)

39
Q

Weber syndrome could result from

A

Lesion in cerebral peduncle, Occulsion of PCA

40
Q

What is the result of a CN III injury and what would cause it?

A

Ipsilateral oculomotor palsy:

eye deviates laterally, ptosis, pupil is dialated and fixed

41
Q

A corticospinal tract lesion in the Cerebral peduncle would result in:

A

contralateral paralysis of lower face, tongue, arms and leg

42
Q

A Lesion in the medullary pyramid is called

A

Medial Medullary syndrome

43
Q

What is a possible cause of medial medullary syndrome?

A

Occulsion of Verterbral artery or anterior spinal artery

44
Q

What three lesions result because of Medial medullary syndrome

A

Corticospinal tract lesion
CNXII lesion
Medial Lemniscus injury

45
Q

Symptoms of Medial Medullary Syndrome

A

Corticospinal tract lesion: contralateral hemiparasis of arm, leg (FACE SPARED)
CNXII injury: Ipsilateral paralysis of tongue (lick wound)
Medial Lemniscus injury: Contralateral loss of touch, vibration, joint position, sensation for half of body

46
Q

What happens to the Medial Lemniscus in a medial medullay syndrome ( occusion of vertebral or anterior spinal artery)

A

Medial Lemniscus injury: Contralateral loss of touch, vibration, joint position, sensation for half of body

47
Q

What happens to the CNXII in a medial medullay syndrome ( occusion of vertebral or anterior spinal artery)

A

Ipsilateral paralysis of tongue

48
Q

What happens to the Corticospinal Tract in a medial medullay syndrome ( occusion of vertebral or anterior spinal artery)

A

Corticospinal tract lesion: contralateral hemiparasis of arm, leg (FACE SPARED)

49
Q

Occusion of the vertebral artery or anterior spinal artery could lead to

A

Medial Medullary Syndrome

50
Q

See signs of ipsilateral spastic paralysis and an ipsilateral Babinski Sign could be

A

a lesion in the spinal cord on the SAME side

Med Neuro Block 3 (9 decks)

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