QUIZ 5

Question 1

what do nociceptor neurons and non-nociceptor somatosensory neurons have in common?

-cell body located in the dorsal root ganglia
-conduction velocity
-unspecialized nerve endings
-specialized nerve endings

Answer 1

cell body located in the dorsal root ganglia

Question 2

what fibers conduct the sensation of first pain?

-myelinated Aβ
-myelinated Aδ
-unmyelinated II
-unmyelinated C

Answer 2

myelinated Aδ

Question 3

which sensation would an individual with anesthetized C fibers report when exposed to intense heat?

-no sensation
-sharp pain only
-dull burning only
-sharp pain followed by a dull burning

Answer 3

sharp pain only

Question 4

which deficit would a lesion restricted to the right side of the spinal cord produce?

-pain deficit on the right side of the body only
-pain deficit on the left side and mechanosensory deficit on the right side of the body
-mechanosensory deficit on the left side of the body only
-pain deficit on the right side and mechanosensory deficit on the left side of the body
-mechanosensory deficit on the right side of the body only

Answer 4

pain deficit on the left side and mechanosensory deficit on the right side of the body

Question 5

disruption of the ____ system prevents the transmission of ____ information

-anterolateral; vibration
-dorsal column-mediated lemniscal; temperature
-anterolateral; mechanosenosry
-anterolateral; visceral pain
-dorsal column-mediated lemniscal; visceral pain

Answer 5

dorsal column-mediated lemniscal; visceral pain

Question 6

which structure contributes to the sensory-discriminative aspect of pain?

-ventral posterior medial and lateral nuclei of the thalamus
-amygdala
-anterior cingulate cortex
-ventral posterior lateral nucleus of thalamus
-ventral posterior medial nucleus of thalamus

Answer 6

ventral posterior medial and lateral nuclei of the thalamus

Question 7

which perception is an example of hyperalgesia?

-pain following sunburn
-sensitivity to innocuous stimulus (like the sound of scratching a plate with a fork)
-pain following a small paper cut
-increased sensitivity to temperature after sunburn

Answer 7

increased sensitivity to temperature after sunburn

Question 8

which statement correctly summarizes the gate theory of pain?

-descending inputs from pain centers directly modify the activity of dorsal horn projection neurons
-flow of ascending pain information is modified by stimuli from cortical centers
-flow of ascending pain information is modified by stimulation of low-threshold mechanoreceptors
-flow of ascending pain information is modified by stimuli from brainstem centers

Answer 8

flow of ascending pain information is modified by stimulation of low-threshold mechanoreceptors