Ascending Pathways (section 3)

Question 0

Afferent input of DCML pathway is innervated by what fibers?

Answer 0

A-beta afferents

Question 1

Dorsal Column-Medial Lemniscal Pathway carries sensations from where?

Answer 1

From the body

Question 2

The afferent fibers of DCML enter the spinal cord at what region

Answer 2

Medial regions of Lissauer’s tract

Question 3

Axons from lower extremities in DCML pathway are termed what?

Answer 3

Fasciculus gracilis

Question 4

Fasciculus cuneatus fibers of DCML pathway are from what part of body?

Answer 4

Upper extremities

Question 5

1st order neurons of DCML pathway

Answer 5

Dorsal root ganglion

Question 6

The dorsal column axons in DCML pathway terminate in the medulla onto what two neurons?

Answer 6

Nucleus gracilis (lower extremities)
Nucleus cuneatus (Upper extermities)

Question 7

Pathway of 1st order neurons in DCML pathway

Answer 7

from peripheral cutaneus receptor to the termination site in the medulla

Question 8

What is the Medial Lemniscus

Answer 8

Name for neurons in nucleus gracilis and nucleus cuneatus that project ascending axons through the brainstem

Question 9

Neurons and their axons in in medial lemniscus are what order neurons in DCML pathway

Answer 9

2nd order neurons

Question 10

What is the name of the crossing fibers in the DCML pathway

Answer 10

internal arcuate fibers

Question 11

What nucleus of the thalamus does the medial lemniscus of the DCML pathway synapse

Answer 11

Ventral posterior lateral nucleus (VPL)

Question 12

Trigmenial Lemniscal pathway carries sensation from where?

Answer 12

The face

Question 13

Innervation fibers of Trigmenial lemniscal pathway

Answer 13

A-beta afferents

Question 14

Upon entering what structure do the axons of the trigeminal ganglion neurons synapse?

Answer 14

Pons

Question 15

What nucleus do the 1st order neurons of Trigmenial Lemniscal pathway synapse

Answer 15

Trigmeninal main sensory nucleus (ipsilateral)

Question 16

Where do axons from trigeminal main sensory nucleus cross?

Answer 16

In the Pons

Question 17

Where do the axons ascend after crossing during the Trigmenial Leminiscus pathway

Answer 17

In the trigeminal lemniscus

Question 18

Where do 2nd order neurons synapse in Trigmenial Lemniscus pathway

Answer 18

in the contralateral thalamus (ventral posterior medial nucleus-VPM)

Question 19

Lateral Spinothalamic Tract is also called what?

Answer 19

Anterolateral System

Question 20

Lateral Spinothalamic tract carries what type of sensation?

Answer 20

Pain

Thermal sense

Question 21

What type of innervation fibers are in the lateral spinothalamic tract?

Answer 21

A-delta

C afferents

Question 22

What are the 1st order neurons of the Lateral Spinothalamic tract

Answer 22

A-delta

C afferents

Question 23

Where in the spinal cord does the 1st order neurons enter

Answer 23

Lateral regions of Lissauer’s tract

Question 24

Where do the 1st order neurons of the Lateral Spinothalamic tract synapse

Answer 24

Substantia gelatinosa of Rexed’s lamina II

Question 25

Lateral spinothalamic trac ascends how many segments of spinal cord before crossing where?

Answer 25

1-2 segments

crossing the midline in the anterior white commissure

Question 26

What are the third order neurons of the Lateral Spinothalamic tract

Answer 26

thalamic neurons

Question 27

Some fibers in Lateral Spinothalamic tract terminate in the brainstem reticular formation are called what?

Answer 27

Spinoreticular tract fibers