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7303 Neuroanatomy > 1.25 Tracts Lecture > Flashcards

1.25 Tracts Lecture Flashcards

1
Q

sensation/s associated with Meissner corpuscles

A

touch: flutter and movement

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2
Q

sensation/s associated with Pacinian corpuscles

A

touch: vibration

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3
Q

sensation/s associated with Ruffini corpuscles

A

touch: skin stretch

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4
Q

sensation/s associated with hair follicles

A

touch: movement

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5
Q

sensation/s associated with Merkel complex

A
  • touch
  • pressure
  • form
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6
Q

sensation/s associated with free nerve endings

A
  • pain
  • touch
  • temperature
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7
Q

primary neuron for anterolateral spinothalamic tract

A

Aδ, large myelinated

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8
Q

another name for anterolateral spinothalamic tract

A

neospinothalamic tract

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9
Q

What does the anterolateral spinothalamic tract transmit?

A

easily localized, fast pain

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10
Q

neurotransmitter for anterolateral spinothalamic tract

A

glutamate

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11
Q

What does glutamate do?

A
  • excitatory

- depolarizes the membrane

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12
Q

anterolateral spinothalamic tract: pathway

A

1˚ nerve endings to DRG to dorsal horn
2˚ dorsal horn, decussates, synapses at thalamus
3˚ thalamus to somatosensory cortex

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13
Q

Where is the somatosensory cortex?

A

postcentral gyrus

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14
Q

How does the 2˚ neuron of the anterolateral spinothalamic tract decussate in the spinal cord?

A

via the anterior white commisure

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15
Q

Where does the 2˚ neuron of the anterolateral spinothalamic tract travel in the spinal cord?

A

along the lateral aspect

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16
Q

What is a lamina?

A
  • histologically, somatotopically arranged

- inside out: cervical, thoracic, lumbar, sacral

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17
Q

What additional info travels through cervical cord?

A

upper limb

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18
Q

What additional info travels through lumbar cord?

A

lower limb

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19
Q

Which is the paleospinothalamic tract?

A

anterior spinothalamic tract

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20
Q

What are the tracts in the anterolateral system?

A
  • (antero)lateral spinothalamic tract

- anterior spinothalamic tract

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21
Q

primary neuron of the anterior spinothalamic tract

A
  • unmyelinated

- free nerve endings

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22
Q

neurotransmitter of the anterior spinothalamic tract

A

Substance P

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23
Q

What does the anterior spinothalamic tract transmit?

A

slow, hard to localize pain

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24
Q

What is a major characteristic of the neurons of the anterior spinothalamic tract?

A
  • easily sensitized

- hitting someone repeatedly: might not hurt initially, but enough times and it will start to

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25
Q

Where do the 2˚ neurons of the anterior spinothalamic tract decussate?

A
  • anterior white commissure

- more medial than the anterolateral spinothalamic tract

26
Q

What are the 3 options for a 2˚ neuron in the anterior spinothalamic tract?

A
  • spinoreticular
  • spinomesencephalic
  • spinolimbic
27
Q

Which two pathways stop in the midbrain?

A
  • spinoreticular

- spinomesencephalic

28
Q

What is the midbrain a part of?

A

brainstem

29
Q

Where does the spinoreticular tract end?

A

reticular formation in the midbrain

30
Q

What is the reticular formation involved with?

A
  • regulating sleep/wake cycles

- if you’re in bad pain, it will wake you up

31
Q

Where does the spinomesencephalic tract stop?

A

midbrain

32
Q

What does the spinomesencephalic tract do?

A

sends motor signals to ocular muscles to look at the source of pain

33
Q

Where does the spinolimbic tract end up?

A
  • can go through the thalamus, but doesn’t have to

LIMBIC SYSTEM

  • striatum
  • amygdala
  • hippocampus
  • somatosensory cortex
34
Q

What is the limbic system involved with?

A
  • emotion

- memory

35
Q

fancy word for discriminate touch

A

stereognosis

36
Q

DCML

A

dorsal column/medial lemniscus

37
Q

What is the DCML involved in?

A
  • discriminate touch (stereognosis)

- conscious proprioception

38
Q

fasciculus

A

bundle of myelinated axons

39
Q

How are the columns of the DCML arranged?

A

somatotopically within their fasciculi

40
Q

funiculis

A

bundle of fasciculi

41
Q

What is the fasciculus for the lower limbs?

A

fasciculus gracilis

42
Q

Where is the fasciculus gracilis located?

A

medial

43
Q

What is the fasciculus for the upper limbs?

A

fasciculus cuneatus

44
Q

Where is the fasciculus cuneatus?

A

lateral

45
Q

Where does the DCML 1˚ neuron synapse?

A

synapses at the medulla at either:

  • nucleus cuneatus
  • nucleus gracilis
46
Q

What does the DCML 2˚ neuron do?

A
  • crosses at the medial lemniscus

- synapses at the thalamus

47
Q

What does the DCML 3˚ neuron do?

A

travels to the somatosensory cortex in the postcentral gyrus

48
Q

medial lemniscus travels in the

A

internal capsule

49
Q

Which tract has a 2˚ neuron that doesn’t synapse in the dorsal horns?

A

DCML

50
Q

What are the spinocerebellar tracts for?

A

unconscious proprioception (unconscious adjustments to posture)

51
Q

Which patients often have problems with their spinocerebellar tracts?

A

diabetics

52
Q

Neurons of the spinocerebellar tracts

A

only have primary and secondary

53
Q

overall pathway of spinocerebellar tracts

A

from muscles, tendons, and joints to the cerebellum

54
Q

What are the spinocerebellar tracts?

A
  • posterior spinocerebellar tract

- cuneocerebellar tracts

55
Q

path of posterior spinocerebellar tract

A

primary: from lower body, synapses at nucleus dorsalis
secondary: nucleus dorsalis to dorsal cerebellar cortex

56
Q

What is the nucleus dorsalis?

A

dorsal gray matter in the spinal cord

57
Q

posterior spinocerebellar tract: What does the 2˚ neuron pass through on the way to the cerebellar cortex?

A

inferior cerebellar peduncle

58
Q

path of the cuneocerebellar tract

A

primary: from upper body, synapses at lateral cuneate nucleus
secondary: lateral cuneate nucleus to ventral cerebellar cortex

59
Q

Where is the lateral cuneate nucleus?

A

in the medulla

60
Q

unconscious proprioception: lower body

A

posterior spinocerebellar tract

61
Q

unconscious proprioception: upper body

A

cuneocerebellar tract

7303 Neuroanatomy (69 decks)

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