Quiz 9- sensory pathways

Question 1

sensory pathways

Answer 1

ascending pathways that carry specific info from sensory receptors to CNS

Question 2

somatosensory stimuli below the neck ascend through ___

Answer 2

the cord

Question 3

somatosensory stimuli from neck and head travel through ____

Answer 3

cranial nerves
(specifically trigeminal nerve)

Question 4

all sensory tracts are composed of ___ cells

Answer 4

3

Question 5

neuronal tracing

Answer 5

experimental use of chemical tracers (carbocyanines) anterograde and retrograde
lesion studies
microscopy

Question 6

sensory nerve tracts

Answer 6

affrent
goes from dorsal root ganglia to brain

Question 7

motor tracts

Answer 7

efferent
goes from motor cortex to cell that projects onto ganglia of cord

Question 8

sensory tract components

Answer 8

dorsal root ganglia- has cell bodies of internal and external sensory neurons
interneurons
thalamus

Question 9

does the path taken have a selective advantage?

Answer 9

no functional advantage
you can take many paths to get to the same lace

Question 10

Tracts

Answer 10

all begin and end in same place
all tracts develop in utero
no advantage of one path over another
clinically, the path they take is critical

Question 11

Two major sensory tracts

Answer 11

dorsal column- fine touch and proprioception
anterolateral- pain and temp

Question 12

Dorsal tracts

Answer 12

myelinated Ab fibers
input from lower body is medial, upper is lateral
1st neurons project into medulla
3rd neurons project into somatosensory cortex

Question 13

anterolateral

Answer 13

begins in dorsal root ganglia ends in thalamus where it protects into somatosensory cortex
spinothalamic
myelinated As fibers
and unmyelinated C fibers

Question 14

spinothalamic tracts

Answer 14

demonstrates convergence
convergence gives up acuity for sensitivity