Ch 11

Question 1

Somatosensory deficits= prone to

Answer 1

Pressure induced skin lesions, burns and joint damage

Question 2

For somatotripic arrangements, axons from one part of body= close to axons carrying signals from ___ parts of body and are segregated from axons carrying info from___ parts of body

Answer 2

Adjacent

Distant

Question 3

What is an example of low fidelity info?

Answer 3

Aching pain (not well localized)

Question 4

Projection neurons are ___

Answer 4

Neurons w/ long axon

Question 5

3 neuron pathway: 1st pathway =___, 2nd= ___, 3rd=___

Answer 5

Info from peripheral receptor -> CNS
Transmits signal - thalamus
Thalamus -> somatosensory cortex

Question 6

Bundle of axons= —

Answer 6

Tract, column, lemniscus, fascicle

Question 7

How to name somatosensory paths

Answer 7

Origin and termination of tract that contains second neuron in series

Question 8

3 types of pathways bring somatosensory info to brain

Answer 8

Conscious relay pathways
Divergent pathways
Nonconscious relay pathways

Question 9

T/F: conscious relay pathway brings info about location and type of stimulation to conscious awareness in cerebral cortex

Answer 9

T

Question 10

Conscious relay pathway =transmitted w/ ___

Answer 10

High fidelity

Question 11

4 types of somatosensory

Answer 11

Light touch
Proprioception
Nociception
Temperature

Question 12

Pathways to consciousness travel upwards in 2 distinct regions of spinal cord:

Answer 12

Dorsal and anterolat columns

Question 13

T/F: stereognosis integrates touch and proprioception info to ID obj w/ eyes open

Answer 13

F: w/o eyes

Question 14

Dorsal column/med lemniscus = pathway that conveys ___ and ___

Answer 14

Light touch
Conscious proprioception

Question 15

Dorsal column pathway (3 neuron relay):

Answer 15

1. receptors -> medulla
2. medulla -> thalamus
3. thalamus -> cerebral cortex

Question 16

Fasciculus gracilis= axons from ___, fasciculus cuneatus= ___

Answer 16

Lower limb (med dorsal column)
Upper limb ( lat dorsal column)

Question 17

T/F: nerve fibers enter dorsal column from higher segments = added medially to fibers already in dorsal column from lower segments

Answer 17

F: laterally

Question 18

Fasciculus gracilis synapses w/ neurons in ___, fasciculus cuneatus synapses w/ =___

Answer 18

Nucleus gracillis
Nucleus cuneatus