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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
Where do the 2˚ neurons of the anterior spinothalamic tract decussate?
- anterior white commissure | - more medial than the anterolateral spinothalamic tract
26
What are the 3 options for a 2˚ neuron in the anterior spinothalamic tract?
- spinoreticular - spinomesencephalic - spinolimbic
27
Which two pathways stop in the midbrain?
- spinoreticular | - spinomesencephalic
28
What is the midbrain a part of?
brainstem
29
Where does the spinoreticular tract end?
reticular formation in the midbrain
30
What is the reticular formation involved with?
- regulating sleep/wake cycles | - if you're in bad pain, it will wake you up
31
Where does the spinomesencephalic tract stop?
midbrain
32
What does the spinomesencephalic tract do?
sends motor signals to ocular muscles to look at the source of pain
33
Where does the spinolimbic tract end up?
- can go through the thalamus, but doesn't have to LIMBIC SYSTEM - striatum - amygdala - hippocampus - somatosensory cortex
34
What is the limbic system involved with?
- emotion | - memory
35
fancy word for discriminate touch
stereognosis
36
DCML
dorsal column/medial lemniscus
37
What is the DCML involved in?
- discriminate touch (stereognosis) | - conscious proprioception
38
fasciculus
bundle of myelinated axons
39
How are the columns of the DCML arranged?
somatotopically within their fasciculi
40
funiculis
bundle of fasciculi
41
What is the fasciculus for the lower limbs?
fasciculus gracilis
42
Where is the fasciculus gracilis located?
medial
43
What is the fasciculus for the upper limbs?
fasciculus cuneatus
44
Where is the fasciculus cuneatus?
lateral
45
Where does the DCML 1˚ neuron synapse?
synapses at the medulla at either: - nucleus cuneatus - nucleus gracilis
46
What does the DCML 2˚ neuron do?
- crosses at the medial lemniscus | - synapses at the thalamus
47
What does the DCML 3˚ neuron do?
travels to the somatosensory cortex in the postcentral gyrus
48
medial lemniscus travels in the
internal capsule
49
Which tract has a 2˚ neuron that doesn't synapse in the dorsal horns?
DCML
50
What are the spinocerebellar tracts for?
unconscious proprioception (unconscious adjustments to posture)
51
Which patients often have problems with their spinocerebellar tracts?
diabetics
52
Neurons of the spinocerebellar tracts
only have primary and secondary
53
overall pathway of spinocerebellar tracts
from muscles, tendons, and joints to the cerebellum
54
What are the spinocerebellar tracts?
- posterior spinocerebellar tract | - cuneocerebellar tracts
55
path of posterior spinocerebellar tract
primary: from lower body, synapses at nucleus dorsalis secondary: nucleus dorsalis to dorsal cerebellar cortex
56
What is the nucleus dorsalis?
dorsal gray matter in the spinal cord
57
posterior spinocerebellar tract: What does the 2˚ neuron pass through on the way to the cerebellar cortex?
inferior cerebellar peduncle
58
path of the cuneocerebellar tract
primary: from upper body, synapses at lateral cuneate nucleus secondary: lateral cuneate nucleus to ventral cerebellar cortex
59
Where is the lateral cuneate nucleus?
in the medulla
60
unconscious proprioception: lower body
posterior spinocerebellar tract
61
unconscious proprioception: upper body
cuneocerebellar tract

7303 Neuroanatomy (69 decks)

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