Sensory Pathways (Lecture #10)

Question 1

what happens if Dorsal Column Medial Lemniscal Pathway is interrupted

Answer 1

los of vibration and proprioception (touch)

Question 2

what happens if Spinothalamic portion of anterolateral pathway is interrupted

Answer 2

loss of pain and temp (touch)

Question 3

where in the spinal cord does the lateral corticospinal tract travel?

Answer 3

lateral

Question 4

where in the spinal cord does the dorsal column medial lemniscal pathway travel

Answer 4

dorsal

Question 5

where in the spinal cord does the spinothalamic portion of the anterolateral pathway travel?

Answer 5

anterior/lateral

Question 6

central cord syndrome will damage axons in what pathway

Answer 6

spinothalamic portion of anterolateral pathway

Question 7

central cord syndrome will cause what kind of sensory loss?

Answer 7

loss of pain and touch in dermatomes

Question 8

how can you tell which side the lesion is on in a hemicord lesion?

Answer 8

lesion is on the side that has vibration loss

Question 9

What will a lesion of lateral aspect of medulla cause?

Answer 9

• loss of pain sensation on face ipsilaterally

- loss of pain and temperature on body contralaterally

Question 10

Distal symmetric polyneuropathy

Answer 10

• small unmylenated axons that convey pain are damaged/destroyed
• typically caused by diabetes

Question 11

effects of hemicord lesion

Answer 11

• loss of motor function and vibration/proprioception ipsilaterally below level of lesion
• loss of pain and temperature contralaterally below level of lesion

Question 12

effects of posterior cord syndrome

Answer 12

loss of vibration and proprioception bilaterally below level of lesion

Question 13

effects of central cord syndrome

Answer 13

loss of pain and temperature bilaterally only at levels of lesion “suspended sensory loss”

Question 14

effects of anterior cord syndrome

Answer 14

• loss of pain and temperature below level of lesion
• LMN weakness of muscles at level of lesion
• UMN weakness below level of lesion (with larger lesion)

Question 15

effects of damage to thalamus/thalamosensory radiations

Answer 15

-contralateral face, arm, and leg sensory loss contralaterally

Question 16

effects of damage to somatosensory cortex

Answer 16

contralateral face, arm, and leg sensory loss

Question 17

which vertebrae are most likely to be involved with cancers metastasizing to the spine

Answer 17

thoracic (vertebral body)

Question 18

transverse myelitis

Answer 18

autoimmune disease that causes swelling in spinal cord; disrupts function of spinal cord and often causes demylination and necrosis of nerve cells

Question 19

spinal shock

Answer 19

Happens initially after spinal cord lesion

• flaccid paralysis below spinal cord lesions
• loss of reflexes
• loss of sympathetic outflow below level of lesion
• bladder loses ability to contract
• fxn can come back

Question 20

paresthesias

Answer 20

abnormal positive sensory symptoms caused by problems in the somatosensory pathways

Question 21

dysesthesia

Answer 21

unpleasant abnormal sensation

Question 22

allodynia

Answer 22

painful sensations provoked by nonpainful stimuli

Question 23

hyperpathia

Answer 23

excruciating pain with minor painful stimuli

Question 24

types of cortical sensations

Answer 24

graphesthesia
stereognosis
tactile extinction

Question 25

graphesthesia

Answer 25

“write” on hand and can tell what was written

Question 26

stereognosis

Answer 26

can tell what something is by feeling it

Question 27

tactile extinction

Answer 27

can’t tell when both sides of body are being touched at same time
-indicates problem in primary association cortex