Session 3 - Spinal Afferent fibres Flashcards Preview

Semester 5 - CNS > Session 3 - Spinal Afferent fibres > Flashcards

Flashcards in Session 3 - Spinal Afferent fibres Deck (33):
1

Name five tracts of the spinal cord

Dorsal Column
Lateral spinothalamic
Anterior spinothalamic
Anterior spinocerebellar
Posterior spinocerebellar

2

What is the function of the dorsal column

Fine touch, vibration

3

How many order neurones are there in the dorsal column tract?

Three

4

What do first order neurones of the dorsal column have their cell body in?

Dorsal root ganglion

5

Where do 2nd order neurone cell bodies of the dorsal column reside?

Cuneate (upper limb)/Gracile nucleus (lower limb)

6

Where are the cell bodies of the third order neurones of the dorsal column?

Thalamus

7

Where does the dorsal column decussate?

Medula

8

Where does the dorsal column decussate?

Somatosensory cortex

9

What is the function of the lateral spinothalamic tract?

Pain
Temperature

10

Where is cell body of 1st order neurone of lateral spinothalamic tract

dorsal root ganglion

11

Where is cell body of 2nd order neurone in lateral spinothalamic tract

Dorsal horn

12

Where is cell body of third order neurone cell body of lateral spinothalamic tract

Thalamus

13

Where does decussation of lateral spinothalamic tract take place

spinal cord

14

Where does termination of lateral spinothalamic tract take place

Somatosensory cortex

15

What is function of anterior spinothalamic tract?

Crude touch
Pressure

16

1st order neurone cell body anterior spinothalamic tract?

Dorsal root ganglion

17

2nd order neurone cell body anterior spinothalamic tract?

Dorsal horn

18

3rd order neurone cell body anterior spinothalamic tract?

thalamus

19

Decussation of anterior spinothalamic tract?

Spinal cord

20

Termination of anterior spinothalamic tract?

Somatosensory cortex

21

What is function of anterior spinocerebellar tract?

Unconscious proprioception

22

1st order neuron cell body anterior spinocerebellar tract?

Dorsal root ganglion

23

2nd order neuron cell body anterior spinocerebellar tract?

spinal grey matter

24

3rd order neurone cell body of anterior spinocerebellar tract?

None

25

Where is decussation of anterior spinocerebellar tract?

Spinal cord (re-crosses at superior cerebellar peduncle)

26

Where is termination of anterior spinocerebellar tract??

Cerebellum

27

Function of posterior spinocerebellar tract#;

Unconscious proprioception

28

1st order neurone cell body anterior spinocerebellar tract?

Dorsal root ganglion

29

2nd order neurone cell body

Cuneate nucleus

30

Termination of anterior spinocerebellar tract?

Cerebellum

31

What does vit b12 deficiency cause?

o Subacute Combined degeneration of dorsal column
Comes about secondary to alcohol addiction

Will have a o Stick and Stamp pattern of gait due to Sensory Ataxia – Loss of sensory input necessary for motor feedback

32

What is syringomyelia?

o Repeated trauma to the neck (e.g. rugby) causes formation of Elongated Cavity or Syrinx around the Central Canal of the spinal cord.
o As it expands it compresses fibres, such as those of the spinothalamic tract which cross segmentally in the midline of the cord.

33

What is Brown-Sequard Syndrome

o Lesion causing hemisection of the spinal cord
o All ascending pathways on one side of the cord are lost
o Fine touch and vibration lost below level of the lesion on the ipsilateral side
 Dorsal Columns travel up cord on ipsilateral side and decussate in the Ventral Medulla
o Pain, Temperature, Crude Touch lost below level of the lesion on the contralateral side
 Spinothalamic Tract decussates in the spinal cord, thus the lesion will effect fibres originating from the contralateral side