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Neuro > Ascending/Descending Pathways > Flashcards

Ascending/Descending Pathways Flashcards

1
Q

describe the corticospinal pathway

A
  1. primary motor cortex
  2. corona radiata
  3. internal capsule
  4. medullary pyramids
  5. decussates in medullary pyramids (lateral) or anterior white commissure (anterior)
  6. ventral horn
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2
Q

describe the corticobulbar pathway

A
  1. primary motor cortex
  2. internal capsule
  3. brainstem
  4. medullary pyramids
  5. motor nuclei of cranial nerves
  6. LMN
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3
Q

describe the spinothalamic pathway

A
  1. sensory receptor
  2. spinal cord
  3. synapses in dorsal horn
  4. decussates
  5. spinal cord
  6. anterior/lateral
  7. synapses in thalamus
  8. internal capsule
  9. somatosensory cortex
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4
Q

describe the DCML pathway

A
  1. sensory receptor
  2. dorsal root ganglion
  3. dorsal root
  4. lateral/medial
  5. synapses in medulla
  6. medial lemniscus
  7. synapses in thalamus
  8. internal capsule
  9. somatosensory cortex
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5
Q

what is the function of the spinothalamic tract?

A

lateral - pain & temperature

anterior - crude touch & pressure

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6
Q

what is the function of the DCML?

A
  • proprioception
  • 2-point discrimination
  • fine touch
  • vibration
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7
Q

does the spinothalamic tract decussate?

A

yes

- dorsal horn

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8
Q

does the DCML tract decussate?

A

yes

- medulla

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9
Q

what is the function of the spinocerebellar tracts?

A

unconscious proprioception

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10
Q

do the spinocerebellar tracts decussate?

A

no

anterior does but twice

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11
Q

what is the function of the pyramidal tracts?

A

conscious muscle control

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12
Q

what is the function of extrapyramidal tracts?

A

unconscious muscle control

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13
Q

name 3 ascending motor tracts

A
  • spinothalamic
  • DCML
  • spinocerebellar
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14
Q

what are the 2 types of descending motor pathways?

A
  • pyramidal

- extrapyramidal

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15
Q

which muscles does the corticobulbar tract supply?

A
  • head

- neck

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16
Q

where do the extrapyramidal tracts orginate?

A

brainstem

17
Q

what is the function of the vestibulospinal tract?

A
  • balance

- posture

18
Q

what is the function of the reticulospinal tract?

A 
medial:
- facilitates voluntary muscle movements 
- increases muscle tone
lateral:
- inhibits voluntary muscle movements
- decreases muscle tone
19
Q

what is the function of the rubrospinal tract?

A

fine control of head movement

20
Q

what is the function of the tectospinal tract?

A

movement of the head in relation to visual stimuli

21
Q

which extrapyramidal tracts decussate?

A
  • rubrospinal

- tectospinal

22
Q

name 2 pyramidal tracts

A
  • corticospinal

- corticobulbar

23
Q

are the pyramidal tracts ascending or descending?

A

descending

24
Q

name 4 extrapyramidal tracts

A
  • vestibulospinal
  • recticulospinal
  • rubrospinal
  • tectospinal

Neuro (6 decks)

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