Sensation of Pain and Temperature

Question 1

modality with free nerve endings, group IV unmyelinated

Answer 1

deep pain (nociceptors)

Question 2

modality with free nerve endings, group III myelinated

Answer 2

pricking pain (nociceptors)

Question 3

type of pain nociceptor with poorly localized, wide receptive fields

Answer 3

deep pain

Question 4

type of pain nociceptor with well localized, smaller receptive fields

Answer 4

pricking pain

Question 5

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

Answer 5

distinct cool (III) and warm (IV) endings

Question 6

nerve ending type III is

Answer 6

small, myelinated

Question 7

nerve ending type IV is

Answer 7

small, unmyelinated

Question 8

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

Answer 8

groups III and IV

Question 9

thresholds are low for:

Answer 9

touch, temperature

Question 10

thresholds are high for

Answer 10

pain

Question 11

physiological process for transduction caused by tissue damage

Answer 11

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

Question 12

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

Answer 12

dorsal root ganglia

Question 13

first synapse of pain and temp pathways are in the

Answer 13

spinal cord dorsal horn

Question 14

pain and temp pathway 2nd synapse

Answer 14

VPL of thalamus

Question 15

pain and temp pathway 3rd synapse

Answer 15

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

Question 16

somatotopic destination of pain and temp is in the

Answer 16

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

Question 17

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

Answer 17

brainstem, reticular formation, hypothalamus

Question 18

somatotopic location in postcentral gyrus for LEG

Answer 18

medial

Question 19

somatotopic location in postcentral gyrus for UPPER LIMB

Answer 19

dorsal and lateral

Question 20

somatotopic location in postcentral gyrus for FACE

Answer 20

central and lateral

Question 21

thalamic nucleus is VPL in _____ (body/face)

Answer 21

body

Question 22

thalamic nucleus is VPM in ____ (body/face)

Answer 22

face

Question 23

primary afferents for pain and temperature are

Answer 23

unmyelinated IV and small myelinated III axons