AP03 Topography of the Major Sensory Systems

Question 1

What nerves are in the trigeminothalamic pathway?

Answer 1

trigeminal
facial
glossopharyngeal
vagus

Question 2

Name the 2 concious ascending tracts

Answer 2

Dorsal column

Anterolateral system

Question 3

What sensory information does the dorsal column transmit?

Answer 3

fine touch
vibration
proprioception

Question 4

What sensory information does the anterolateral system transmit?

Answer 4

anterior spinothalamic tract - touch and pressure

lateral spinothalamic tract - pain and temperature

Question 5

which part of the dorsal column carries information from the upper limb (T6 and above)?

Answer 5

fasciculus cuneatus

Question 6

Where do 1st order neurones in the fasciculus cuneatus synapse superiorly?

Answer 6

nucleus cuneatus (medulla oblongata)

Question 7

Where do 1st order neurones in the fasciculus gracilis synapse superiorly?

Answer 7

nucleus gracilis (medullar oblongata

Question 8

What part of the dorsal column carries information from the lower limb (below T6)?

Answer 8

fasciculus gracilis

Question 9

Where do 2nd order neurones associated with the dorsal column decussate?

Answer 9

medulla oblongata

Question 10

What is the pathway of 3rd order neurones associated with the dorsal column?

Answer 10

start in the ventral posterolateral nucleus of the thalamus

through the internal capsule

terminate at the sensory cortex

Question 11

What is the main unconcious spinal sensory tract?

Answer 11

spinocerebellar tract(s)

Question 12

What are the divisions of the spinocerebellar tract?

Answer 12

posterior spinocerebellar
cuneocerebellar
anterior spinocerebellar
rostral spinocerebellar

Question 13

What general sensory information do the spinocerebellar tracts carry?

Answer 13

proprioception

Question 14

From which area of the body does the posterior spinocerebellar tract carry sensory information?

Answer 14

lower limbs

Question 15

From which area of the body does the cuneocerebellar tract carry sensory information from?

Answer 15

upper limbs

Question 16

From which area of the body does the anterior spinocerebellar tract carry sensory information frrom?

Answer 16

lower limbs

Question 17

From which area of the body does the rostral spinocerebellar tract carry sensory information from?

Answer 17

upper limbs

Question 18

Which spinocerebellar tract decussates twice?

Answer 18

anterior spinocerebellar tract

Question 19

What structures connect the cerebellum to the brainstem?

Answer 19

3 cerebellar peduncles

Question 20

Which 3 nuclei receive information from the 1st order neurones of the trigeminothalamic tract?

Answer 20

mesencephalic nuceleus
chief sensory nucleus
nucleus of the spinal tract of the trigeminal nerve

Question 21

What sensory information does the mesencephalic nucleus receive?

Answer 21

proprioception

Question 22

What sensory information does the chief sensory nucleus receive?

Answer 22

touch and pressure

Question 23

What sensory information does the nucleus of the spinal tract receive?

Answer 23

pain and temperature

Question 24

What might Brown-Sequard syndrome be caused by?

Answer 24

damage to one side of the spinal cord

Question 25

What symptoms might be associated with right-sided hemisection of spinal cord at T12?

Answer 25

right. ..
- loss of all sensation at T12
- paralysis and loss of proprioception and vibraiton below T12

left. ..
- loss of pain and temperature sensation below T12

Question 26

What is another name for the spinal tract of Lissauer?

Answer 26

The dorsolateral fasciculus

Question 27

What does the spinal tract of Lissauer act as an interface between?

Answer 27

dorsal roots and and dorsal horn