Exam #1: Sensory III Flashcards Preview

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Flashcards in Exam #1: Sensory III Deck (13)
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1
Q

Where does the Paleospinothalamic System relay nociception form the body to?

A
  • Retircular formation
  • Hypothalamus
  • Thalamus
  • Midbrain
  • Limbic System
2
Q

Does the nociception from the Paleospinothalamic System reach consciousness?

A

NO–serves as an alert system that triggers protective reflexes

3
Q

What tracts of the ALS compose the Paleospinothalamic System?

A
  • Spinoreticular
  • Spinohypothalamic
  • Spinomesencephalic
  • Spinotectal
4
Q

What types of sensations are relayed by the Paleospinothalamic System?

A

Slow, dull, poorly-localized pain sensation

5
Q

Where are the neurons for the Paleospinothalamic System

A

1) Cell body DRG
2) Dorsal horn
3) Third order is unclear…

6
Q

What types of fibers carry initial sensory information from the free nerve ending nociceptors?

A

C–unmyelianted (thin)

7
Q

What is the function of the reticular formation?

A

Arousal
Wakefulness
Alertness

8
Q

What is the function of the spinoreticular system?

A

Set of the body’s alarm system in response to pain

9
Q

Where does the spinotectal tract terminate? What is the function of this tract?

A

Superior colliculus, which then sends signals back down to motor neurons to turn your head, eyes, and trunk in the direction of the noxious stimulus

10
Q

Where does the spinohypothalamic tract terminate? What is the function?

A
  • Hypothalamus

- ANS reflex responses i.e. hypertension, tachycardia, tachypnea

11
Q

What is the spinomesencephalic tract?

A

Tract to the midbrain, specifically the periaquetductal gray matter (PAG) that contains neurons that descend down to the brainstem that modulate nociception

12
Q

What part of the thalamus do the reticular fibers synapase with? What is the implication

A

Intralaminar nuclei

*These are NOT somatotopically organized–difficult to localized the origin of pain

13
Q

What does the limbic cortex do in regards to pain?

A

This is the emotional/suffering component of pain

*Lesion= patient does NOT complain of pain