2A. Nociception

Question 1

Is the body’s response to a noxious stimulus and pain is how we respond to that stimulus

Answer 1

Nociception

Question 2

Separate system for the Body using ___________ nerves, Spinothalmic tract

Answer 2

Spinal

Question 3

Separate system for Head using ________ nerves, Quintothalamic tract

Answer 3

Cranial

Question 4

Spinal reflex arcs for nociception
- Direct synapse of sensory fiber with Motor neuron

Answer 4

monosynaptic

Question 5

Spinal reflex arcs for nociception
- interneurons in the reflex arc

Answer 5

Polysynaptic

Question 6

Relay of nociception to higher centers: Spinothalamic Tract
(classic pathway in primates is shown)
- DRG
- axons ascend or descend a few segments forming the dorsolateral fasciculus (known as Lissaur’s Tract)

Answer 6

1st neuron

Question 7

Relay of nociception to higher centers: Spinothalamic Tract
(classic pathway in primates is shown)
- dorsal gray horn spinal cord
- axons immediately cross and ascend contralateral in the ventrolateral funiculus as the spinothalamic tract

Answer 7

2nd neuron

Question 8

Relay of nociception to higher centers: Spinothalamic Tract
(classic pathway in primates is shown)
- ventral caudal lateral nucleus of the thalamus VCL
- axons contribute to formation of Internal Capsule ascend to appropriate part of cerebral cortex

Answer 8

3rd neuron

Question 9

In animals the Spinothalamic Tract is _________________ and _____________ with many synapses

Answer 9

bilateral, diffuse

Question 10

Nociception participates in a localized _________ activity where we can assess specific segments of the cord or that information if it is given a strong enough stimulus can also then be ________________ to the higher levels for the Conscious perception of pain

Answer 10

reflex, relayed

Question 11

Cranial Reflex Arc: Quintothalamic Tract
- Trigeminal ganglion
- axons ascend and descend a short distance forming the spinal tract of the trigeminal nerve

Answer 11

1st neuron

Question 12

Cranial Reflex Arc: Quintothalamic Tract
- location depends on the modality of sensation: pontine sensory nucleus: mechanical type of sensation spinal nucleus of the trigeminal nerve: thermal type of sensation
- axon synapses in the brainstem on motor nuclei of appropriate cranial nerves

Answer 12

2nd neuron

Question 13

GSA function in the head and face region that is served by cranial nerve # _________

Answer 13

V

Question 14

Cranial Reflex Arc: Quintothalamic Tract
- any motor neuron of the appropriate cranial nerve
- axon leaves the brainstem through a cranial nerve to reach the peripheral target

Answer 14

3rd neuron

Question 15

Mesencephalon =

Answer 15

Midbrain

Question 16

Metencephalon =

Answer 16

pons

Question 17

Myelencephalon =

Answer 17

Medulla

Question 18

First order neurons in the quintothalamic tract are located in the:

Answer 18

Trigeminal Ganglion

Question 19

Pontine sensory nucleus: _____________ type of sensation

Answer 19

mechanical

Question 20

Spinal nucleus of the trigeminal nerve: _____________ type of sensation

Answer 20

Thermal

Question 21

Quintothalamic tract for Relay to higher centers
- Trigeminal ganglion
- axons ascend and descend a short distance forming the spinal tract of the trigeminal nerve

Answer 21

1st neuron

Question 22

Quintothalamic tract for Relay to higher centers
- location depends on modality of sensation: Pontine Sensory nucleus: Mechanical type of sensation
Spinal nucleus of the Trigeminal nerve: Thermal type of sensation
- axons immediately cross to the opposite side and ascend contralaterally as the Trigeminal Lemniscus

Answer 22

2nd neuron

Question 23

Quintothalamic tract for Relay to higher centers
- ventral caudal medial nucleus of the thalamus VCM
- axons contribute to the formation of the Internal Capsule and synapse in the appropriate part of the Cerebral Cortex

Answer 23

3rd neuron