Pathway for pain, Temperature and Crude Touch for the body

Question 1

Where is fast pain perception information delivered?

Answer 1

From the peripheral receptor to the somatosensory cortex of the pariental lobe

Question 2

What does the fast pain perception permit for sensation?

Answer 2

Permits awareness of fast, sharp and precisely localized pain

Question 3

What are the primary neurons of pain, temperature and crude touch for the body?

Answer 3

Small and intermediate size pseudounipolar neurons in the dorsal root ganglia with collateral axons

Question 4

What fibers are associated with the primary neurons for pain, temperature and crude touch for the body?

Answer 4

Fibers are Group A delta and C for pain and temperature

Question 5

Where are the peripheral processes of pain, temperature and crude touch for the body found?

Answer 5

Associated with a receptor in the peripheral tissue

Question 6

What do peripheral process fibers of pain, temperature and crude touch for the body do?

Answer 6

Transmits a coded message from the receptor towards the DRG and spinal cord

Question 7

Where are the central processes of pain, temperature and crude touch for the body found?

Answer 7

Traverses the dorsal rootlets of a spinal nerve

Question 8

Where do central process fibers of pain, temperature and crude touch for the body enter the spinal cord?

Answer 8

Enters the cord through the dorsal root zone

Question 9

Which part of the spinal cord does the central process of pain, temperature and crude touch for the body ascend or descend the cord?

Answer 9

They enter the ipsilateral dorsolateral tract (lissaeurs tract) and branch into ascending and descending collaterals

Question 10

How many segments do the collaterals of the central process of pain, temperature and crude touch for the body ascend or descend?

Answer 10

Collaterals ascend or descend in the dorolateral tract for 1-2 segments (up to 4 segments) and then terminate in spinal cord gray matter

Question 11

What does sensory information from A delta and C fibers of the central processes of pain, temperature and crude touch for the body influence?

Answer 11

Motor neurons in the spinal cord for reflex responses and secondary neurons of the ascending pathway

Question 12

What are the secondary neurons of pain, temperature and crude touch for the body also known as?

Answer 12

Tract cells/neurons

Question 13

In which laminae of the spinal cord are the secondary neuron cell bodies of pain, temperature and crude touch for the body located?

Answer 13

Mostly in laminae IV, V, VI but also in lamina I of the ipsilateral dorsal hron

Question 14

Where do the second order neurons of pain, temperature and crude touch for the body travel?

Answer 14

Axons of the second order neurons decussate to the contralateral side of the cord in the anterior white commissure

Question 15

Where do the decussating fibers of the tract cells ascend the spinal cord for pain, temperature and crude touch for the body

Answer 15

The decussating fibers start to ascendin the anterolateral part of the spinal cord white matter forming the spinothalmic tract or the anterolateral system

Question 16

Where does the information carried by the second order fibers of the spinothalmic tract originate from the pain, temperature and crude touch for the body

Answer 16

Contralateral side of the body

Question 17

As the fibers of pain, temperature and crude touch for the body ascend the cord are they joined by other fibers?

Answer 17

Yes, they are joined along the medial edge of the tract by additional crossing fibers leading to somatotopic organization (ie: saccral, lumbar, thoracic and cervical additions)

Question 18

Where do the second order neurons from the pain, temperature and crude touch for the body terminate?

Answer 18

Fibers of the spinothalamic tract ascend through the brainstem and terminate in the ventral posterior thalamus

Question 19

Where is the third order neuron cell body from the pain, temperature and crude touch for the body found?

Answer 19

Ventral posterior lateral nucleus of the thalamus

Question 20

Where do the third order neuron fibers from the pain, temperature and crude touch for the body travel?

Answer 20

Project through the posterior limb of the internal capsule to the postcentral gyrus and the posterior part of the paracentral lobule of the parietal lobe

Question 21

What does the projection of pain and temperature information from the body to the somesthetic cortex apear necessary for?

Answer 21

Necessary to permit one to appreciate discriminate aspects of a stimulus ie: fast, sharp pain

Question 22

Where do most of the fibers in the spinothalamic tract project to for the pain, temperature and crude touch of the body?

Answer 22

Neurons of the VPL nucleus of the thalamus

Question 23

What is the pathway for pain, temperature and crude touch for the body also known as?

Answer 23

Lateral (projecting) spinothalamic tract

Question 24

What is the lateral spinothalamic tract responsible for?

Answer 24

The fast stage of pain (discriminate pain, sharp and well localized intensity