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Flashcards in Somatosensory Exam Deck (23):
1

Autonomic neurons are located where in the spinal cord?

intermediolateral gray horn

2

Pain, temperature, crude touch fibers upon entry in spinal cord do what?

ASCEND one level THEN decussate within the gray matter

3

3rd order sensory neurons send axons to

post-central gyrus / BA 3,1,2

4

DC-ML fibers decussate and ascend

ascend ipsilaterally in dorsal column
decussate at medulla

5

2nd order neurons send axons to

VPL of thalamus

6

Visceral pain uses what fibers

C delta

7

Neuropathic pain uses what fibers

A delta and C

8

What part of the brain is involved in psychogenic pain?

anterior cingulate cortex

9

Cell bodies for somatic fibers are located

dorsal ganglia

10

Cell bodies for visceral fibers are located

sympathetic ganglia

11

Largest, fastest, most thickly myelinated fiber

A Beta fibers

12

Smallest, slowest, unmyelinated

C fibers

13

Fast, large, less myelinated

A Delta

14

Fibers for fast pain, cold, crude touch

A Delta

15

Fibers for Slow pain, warmth

C

16

Pathway for acute pain (A delta)

Dorsal ganglia (ascend then cross)
VPL
Post-central gyrus

17

Pathway for lingering pain (C)

Dorsal ganglia (ascend then cross)
Centromedial thalamus (impulses also go to brainstem)
Frontal and Limbic

18

What is used as a noninvasive means of assessing somatosensory system functioning by producing a pinprick sensation after which it is recorded.

Somatosensory evoked potential

19

Absence of pain in response to stimulation which would normally be painful

analgesia

20

Diminished pain in response to a normally painful stimulus

hypoalgesia

21

Unpleasant, abnormal sensation either spontaneous or evoked

dysesthesia

22

Exaggerated or increased response to a painful stimulus

hyperalgesia

23

Pain due to a stimulus which does not normally provoke pain

allodynia