Sensation of Pain and Temperature Flashcards

1
Q

modality with free nerve endings, group IV unmyelinated

A

deep pain (nociceptors)

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2
Q

modality with free nerve endings, group III myelinated

A

pricking pain (nociceptors)

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3
Q

type of pain nociceptor with poorly localized, wide receptive fields

A

deep pain

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4
Q

type of pain nociceptor with well localized, smaller receptive fields

A

pricking pain

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5
Q

what types of nerve ending(s) does temperature (thermoreceptors) have?

A

distinct cool (III) and warm (IV) endings

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6
Q

nerve ending type III is

A

small, myelinated

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7
Q

nerve ending type IV is

A

small, unmyelinated

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8
Q

light “crude” touch has what nerve ending type(s)?

A

groups III and IV

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9
Q

thresholds are low for:

A

touch, temperature

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10
Q

thresholds are high for

A

pain

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11
Q

physiological process for transduction caused by tissue damage

A

tissue damage releases intracellular materials (e.g. K+) which depolarizes nociceptor

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12
Q

for pain and temp, where are the cell bodies of primary afferents?

A

dorsal root ganglia

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13
Q

first synapse of pain and temp pathways are in the

A

spinal cord dorsal horn

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14
Q

pain and temp pathway 2nd synapse

A

VPL of thalamus

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15
Q

pain and temp pathway 3rd synapse

A

cortex (parietal lobe, areas 3,2,1)

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16
Q

somatotopic destination of pain and temp is in the

A

postcentral gyrus in parietal lobe (Broadmann area 3, 2, 1)

17
Q

additional endings of pain and temp can go to what structures?

A

brainstem, reticular formation, hypothalamus

18
Q

somatotopic location in postcentral gyrus for LEG

A

medial

19
Q

somatotopic location in postcentral gyrus for UPPER LIMB

A

dorsal and lateral

20
Q

somatotopic location in postcentral gyrus for FACE

A

central and lateral

21
Q

thalamic nucleus is VPL in _____ (body/face)

A

body

22
Q

thalamic nucleus is VPM in ____ (body/face)

A

face

23
Q

primary afferents for pain and temperature are

A

unmyelinated IV and small myelinated III axons