Ascending tracts- Spinothalamic tract

Question 1

What are the two division of the spinothalamic tract?

Answer 1

Anterior (ventral) and Lateral

Question 2

What does the spinothalamic tract carry?

Answer 2

Pain and temp

Question 3

What stimuli activate A(delta) fibers (fast pain)?

Answer 3

Cold temp and mechanical stimuli

Question 4

What stimuli activate C fibers (slow pain)?

Answer 4

Hot temp, mechanical, and chemical stimuli

Question 5

What do free nerve endings respond to?

Answer 5

Crude touch and pressure

Question 6

What layer of laminae do C fibers synapse on?

Answer 6

2 and 3

Question 7

What layer of laminae do A(delta) fibers synapse on?

Answer 7

1 and 5

Question 8

Where do the fibers enter the SC?

Answer 8

DRG

Question 9

When the fibers enter the posterior gray horn what does it give off?

Answer 9

An ascending and descending branches that go up or down 1-2 segments

Question 10

What are the ascending and descending branches that go up or down 1-2 segments called?

Answer 10

Lissauer’s tract

Question 11

If there is a lesion in T6 where will the problem actually be located in?

Answer 11

1-2 segments levels down and contralateral

Question 12

Where is the first order neuron located?

Answer 12

Dorsal root ganglion

Question 13

Where are the fibers traveling to from the DRG?

Answer 13

Contralaterally to the anterior white commissure

Question 14

Where are the fibers traveling to from the anterior white commissure?

Answer 14

LST

Question 15

Where is the third order neuron located?

Answer 15

VPL

Question 16

Where are some areas that the fibers travel to after synapsing on VPL?

Answer 16

1/3 posterior limb of internal capsule to Postcentral gyrus of Cerebral cortex