Ascending Pathways

Question 0

What are the functions of the dorsal column medial meniscal tract?

Answer 0

Fine touch
Vibration
Proprioception

Question 1

What are two conscious tracts?

Answer 1

Dorsal column medial meniscal

Antero-lateral

Question 2

How many neurones are involved in the dorsal column medial lemniscal tract?

Answer 2

3

Question 3

Where does the first order neurone of the dorsal column medial lemniscal tract arise and where does it end?

Answer 3

Dorsal root ganglion to either nucleus gracilis or nucleus cuneatus in medulla oblongata

Question 4

What is the pathway for the upper limb for dorsal column medial meniscal tract?

Answer 4

Fasciculus cuneatus

Question 5

What is the pathway for the lower limb for dorsal column medial meniscal tract?

Answer 5

Fasciculus gracilis

Question 6

Why does the second order neurone of the dorsal column medial lemniscal tract begin and where does it end?

Answer 6

Gracilis/cuneatus nucleus in medulla

Ends in the ventral posterolateral nucleus of thalamus

Question 7

Why does the third order neurone of the dorsal column medial lemniscal tract start and end?

Answer 7

Starts in ventral posterolateral nucleus of thalamus

Ends in the sensory cortex

Question 8

Where does the dorsal column medial meniscal tract desiccate?

Answer 8

Medulla

Question 9

What is the function of the anterior spinothalamic tract?

Answer 9

Crude touch and pressure

Question 10

What is the function of the lateral spinothalamic tract?

Answer 10

Pain and temperature

Question 11

Where do the first order neurones for the anteriolateral system arise and end?

Answer 11

Arise in dorsal root ganglion and end in substantia gelatinosa of dorsal horn

Question 12

Where do the second order neurones of the anteriolateral system arise and end?

Answer 12

Arise in the substantial gelatinosa are as either the anterior spinothalamic tract or the lateral spinothalamic tract and end in the ventral posterolateral nucleus of thalamus

Question 13

Where do the third order neurones of the anterolateral system arise and end?

Answer 13

Ventral posterolateral nucleus of thalamus and end in the sensory cortex

Question 14

Where does the anterolateral tract dessucate?

Answer 14

Spinal cord

Question 15

What are the unconscious proprioception tracts?

Answer 15

Cuneocerebellar
posterior spinocerebellar
anterior spinocerebellar

Question 16

Explain the pathway of the anterior spinocerebellar tract

Answer 16

Dorsal root ganglion -> spinal-cord grey matter where it decussates -> cerebellum

Question 17

Explain the pathway of the posterior spinocerebellar tract

Answer 17

Dorsal root ganglion -> grey mater of spinal-cord -> cerebellum

Question 18

Explain the pathway of the cuneocerebellar tract

Answer 18

Dorsal root ganglion -> nucleus cuneatus -> cerebellum

Question 19

What are the unconscious tracts responsible for?

Answer 19

Unconscious proprioception and also important for brain coordination and refining motor movements

Question 20

What is the anterior and posterior spinocerebellar tract responsible for?

Answer 20

Carrying proprioceptive information from the lower limb to the ipsilateral cerebellum
The anterior decussates twice and the posterior does not decussate

Question 21

What is the rostral spinocerebellar tract responsible for?

Answer 21

Carrying proprioceptive information from the upper limbs to the ipsilateral cerebellum

Question 22

What can lesion of the dorsal column medial lemniscal tract be caused by?

Answer 22

Vitamin B12 deficiency and tabes dorsalis so neurosyphilis

Question 23

What is brown sequard syndrome?

Answer 23

A hemisection of the spinal-cord most likely due to trauma and involves that anteriolateral system and the dorsal column medial lemniscal pathway

Question 24

What happens if the spinocerebellar tracts are injured?

Answer 24

Ipsilateral loss of muscle coordination but unlikely to be damaged alone often descending motor tracts are damaged which causes muscle weakness or paralysis and sometimes loss of muscle coordination is masked