Pain Pathways - 4/19 Stephens

Question 1

In the slow pain pathway, primary fibers will enter the spinal cord and ascend/descend a # of segments in the dorsolateral fasciculus of Lissauer. However, the majority of them will terminate where?

Answer 1

Nucleus proprius

Question 2

Slow pain pathway secondary axons course where? Terminate where?

Form what?

Answer 2

Course bilaterally in the ant., lateral, post. Regions of fasciculus proprius (FP)
Terminate on interneurons

Form stereotyped Intersegmental reflexes

Question 3

The FP is a part of a diffuse neuronal net called _____ which surrounds the gray matter of the spinal cord and extends roster ally through the core of the brainstem to the thalamus

Answer 3

Reticular formation (RF)

Question 4

The information from the slow pain pathway will eventually terminate where?

Answer 4

Central median Nucleus of the thalamus and hypothalamus

Question 5

Slow pain information from the NP may ascend to the thalamus as what?

Answer 5

Spina reticular fibers

Question 6

Unilateral lesions of the spin reticular fibers of the slow pain pathway result in what kind of deficit?

Answer 6

No Significant sensory deficit because it is a bilateral and diffuse pathway

Question 7

In the lateral division of the dorsal root of the spinal cord, A delta and C type fibers do what in the dorsolateral fasciculus?

Where do A delta and C type fibers terminate on secondary neurons in the Direct Spinothalamic Pathway?

Answer 7

Ascend and descend 2 segments

A - SG

C - NP

Question 8

Where is the LSTT located?

Answer 8

Anterolateral funiculus

Question 9

What plays a role in arousal and attentiveness?

Answer 9

Reticular formation

Question 10

Where is the periaqueductal gray located?

Fx?

Answer 10

Tegmentum of midbrain

Pain, micturition

Question 11

Slow pain fibers travel via what pathway?

Carry what type of fibers?

Answer 11

Indirect spinotalamic pathway

C type fibers