Spinal Cord Ascending Systems Flashcards Preview

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Flashcards in Spinal Cord Ascending Systems Deck (30):
1

What information is relayed on the dorsal column pathway (DCP)?

Proprioception
2 Point Discrimination
Vibration Sense

GSA function

2

What are the fast adapting receptors?

Hair Follicle
Meissner's Corpuscle
Pacinian Corpuscle

3

What are the slow reacting receptors?

Free Nerve Endings
Merkel's Disk
Ruffini Ending
Joint Receptor
Neuromuscular Spindle
Golgi Tendon Organs

4

What do free nerve endings detect?

Pain and Temperature

5

What do Merkel's Disk detect?

Touch

6

What do hair follicles detect?

Touch

7

What do Meissner's Corpuscles detect?

2 point discrimination

8

What do Pacinian Corpuscles detect?

Vibration

9

What do joint receptors detect?

Joint Position

10

What do neuromuscular spindles detect?

Limb and muscle stretch

11

What do Golgi Tendon Organs detect?

Muscle tension

12

What do Ruffini Corpuscles detect?

Stretch and pressure

13

Describe the pathway of the DCP.

Receptors ->
Gray Matter ->
Fasciculus Gracilis (medial - lower body) OR Fasciculus Cuneatus (lateral - upper body) ->
Nucleus Gracilis/Cuneatus (SYNAPSE) ->
Thalamus as the Ventral Posterolateral Nucleus (SYNAPSE)

14

What are other names for the motor cortex?

Area 4
Precentral Gyrus

15

What are other names for the sensory cortex?

Area 312
Postcentral Gyrus

16

Descibe the 3 orders of neurons in the DCP.

1st Order - go from the limb to the nucleus cuneatus/gracilis and synapse

2nd Order - cross the midline through the medial lemniscus and synapse at the VPL in the thalamus

3rd Order - synapse on the post central gyrus of the sensory cortex

17

What are the fibers to the medial lemniscus that cross the midline called?

Internal Arcuate

18

What is Romberg's sign (tabes dorsalis)?

It is positive if patient requires vision to stand. It appears positive in sensory ataxia.

19

Describe the pathway of the spinothalamic tract.

Receptors ->
Gray Matter (SYNAPSE) crosses midline ->
Neospinothalamic Tract ->
Thalamus at the VPS (SYNAPSE)

20

Describe the effects of syringomyelia.

As the tub expands in the spinal cord, it will hit the STT and affect the arms first and move downwards.

21

What are the effects of the Brown-Sequard lesion?

Pain and temperature sensation are lost from the opposite side of the lesion and proprioception from the same side.

22

What do the spinocerebellar tracts detect?

Unconscious proprioception

23

Where are the spinocerebellar tracts located?

On the very lateral part of the white matter

24

What do the spinocerebellar tracts arise from?

Clark's Nucleus (Nucleus Dorsalis)

25

What information do the spinocerebellar tracts relay?

Muscle Stretch

26

Describe the path of the dorsal spinocerebellar tract.

Receptor ->
Nucleus Dorsalis in the Gray Matter (SYNAPSE) ->
DSCT in White Matter ->
Inferior Cerebellar Peduncle ->
Cerebellum (SYNAPSE)

27

Describe the path of the cuneocerebellar tract.

Receptor ->
Gray Matter ->
Fasciculus Cuneatus ->
Accessory Cuneate Nucleus (SYNAPSE) ->
Inferior Cerebellar Peduncle ->
Cerebellum (SYNAPSE)

28

Where is the DSCT located?

At the levels of C8 - L2

29

What is the function of the ventral spinocerebellar tract?

It monitors the activity of the interneurons in the gray matter and relays the information to the cerebellum

30

What is the pathway of the VSCT?

Gray Matter (crosses midline) ->
VSCT on White Matter) ->
Superior Cerebellar Peduncle (crosses midline ->
Cerebellum (SYNAPSE)