4-Anterolateral System

Question 1

nociception

Answer 1

physiological reception of noxious info elicited by tissue injury

anterolateral system

Question 2

pain

Answer 2

subjective perception feeling of discomfort or agoinzing sensation
-variable intensity
-elicited by stim of sensory nerve endings

Question 3

what does anterolateral system transmit

Answer 3

1. nociception
2. thermal

some nondiscrim and pressure/proprio

aka pain and temp

Question 4

what tracts in the ALS

Answer 4

1. anterior spinothalamic
2. lateral spinothalamic
3. spinoreticular
4. sinotectal
5. spinomesencephalic
6. spinohypothalamic

Question 5

neospinothalamic system

aka spinothalamic tract

Answer 5

direct pathway- spinal cord > thalamus > sensory cortex
-conscious
-fast/sharp/well localized short term pain

Question 6

tracts of paleospinothalamic

Answer 6

1. spinohypothalamic
2. spinomesencephalic
3. spinotectal

Question 7

paleospinothalamic system

spinoreticular tract

Answer 7

indirect- spinal cord > RF > thalmus > hypothalamus > limbic cortex
NOT enter consciousness

aching, poorly localized, persistent pain

85% of noci fibers

Question 8

dermatomes

Answer 8

strip of skin inn by pair of spinal nerves

Question 9

neurons of neospino system

Answer 9

free nerve endings receptors >
1. DRG
2. dorsal horn of spinal cord
3. VPL of thalamus

Question 10

pathway in dorsal horn

Answer 10

-dorsolateral tract of lissauer with lightly mye axons (white matter) short ascend + descend fibers
-substantia gelatinosa where axons from lissauer synapse (grey matter)

axons will cross in vental white commissure to form spinothalamic tracts

paleo dont cross just syn at laminae

Question 11

lesion in spinothalamic tract

Answer 11

def in contralateral side bc secondary fibers already crossed

Question 12

paleospino transmits what

Answer 12

nociception to
1. reticular formation
2. thalamus (intralaminar nuclei)
3. hypothalamus
4. midbrain (sup colliculi, PAG)
5. limbic system

triggers reflexes not consciousness

Question 13

paleo neuron bodies

Answer 13

1. DRG
2. dorsal horn of spinal cord

Question 14

spinohypothalamic tract

Answer 14

for ANS and reflex resp to pain to protect body

Question 15

spinomesencephalic tract

Answer 15

to periaqueductal gray (modulates transmission of nociception)

Question 16

spinotectal tract

Answer 16

reflex of turning eyes, head, upper trunk in direction of noxious stim

Question 17

spinoreticular tract

Answer 17

sets off alarm system in resp to pain

Question 18

reticular formation

Answer 18

arousal
wakefulness
alterness

Question 19

limbic system

Answer 19

affection/emotion component of pain

Question 20

spinothalamic tract = what part of the cord

Answer 20

lateral + anterior funiculus

Question 21

radicular pain pathway

Answer 21

1. compress/pinching by herniated disc, bone spur, local ligaments
2. irritate dorsal root
3. pain-sharp, burning, shooting + paresthesia-numbness, tingling, itching

Question 22

where to tractotomy

sever spinal cord

Answer 22

1. 3 levels above pain
2. cross over other side
3. one up

to sever second order neurons that synapse with ascending branches of primary

Question 23

referred pain

Answer 23

nociception transmitted to sensory cortex where somatic structure is mapped
-trick brain that pain is coming from somatic instead of visceral structure

convergence projection theory of visceral pain

Question 24

syringomyelia

Answer 24

cavitation of spinal cord/enlargement from trauma
-axons in anterior white commissure are stretched and damaged = loss of pain/temp sensation bilaterally