Ascending and Descending Pathway Flashcards Preview

Neurology Year 3 > Ascending and Descending Pathway > Flashcards

Flashcards in Ascending and Descending Pathway Deck (88)
Loading flashcards...
1

Generally what are ascending pathways main modality?

Sensory

2

Generally what are descending pathways main modality?

Motor

3

What column is involved with Fine Touch and conscious proprioception?

Dorsal Column / Medial Lemniscus system

4

What divides the upper and lower fasciculus in the DCML?

T6

5

Cutaneous receptors below T6 trigger an AP which travels along what?

Fascicule Gracilis

6

Cutaneous receptors above T6 trigger an AP which travels along what?

Fascicule Cutanea

7

Fibres from below T6 synapse where?

Nuclei Grascilis - within medulla

8

Fibres from above T6 synapse where?

Nuclei Cutanea - within medulla

9

At what level do neurones from the DCML cross over?

Level of the medulla.

10

Where within the brain do 2nd order neurones synapse?
DCML

Ventral Posterolateral Nuclei - within the thalamus

11

Where within the brain do 3rd order neurones synapse?
DCML

Primary somatosensory cortex
Post Central Gyrus

12

3rd order neurones travel within this to reach the primary somatosensory cortex.
DCML

Posterior Internal Capsule

13

If originating above T6 where do 1st order neurones synapse?
DCML

Nucleus Cutanea - within medulla

14

What tract deals with Pain Temperature and deep pressure?

Spinothalmic tract / Anterolateral Column

15

Generally what cutaneous receptors deal with pain?

Nociceptors

16

Where do 1st order neurones synapse within the spinothalmic tract?

Posterior horn

17

At what level do neurones of Spinothalmic tract cross over?

At the level it synapses they cross over before climbing anterolaterally.

18

Where do second order neurones synapse within the spinothalmic tract?

Pass through straight to the ventral Posterolateral Nucleus

19

Where are motor action potentials generated?

Precentral Gyrus

20

From where do Upper Motor Neurones originate and where do they synapse?

Originate at precentral gyrus
Synapse within anterior horn.

21

Within the Midbrain where do UMN pass?

Cerebral Peduncles

22

Where within the medulla do the UMN pass?

Pyramids of the medulla, located on the anterior portion.

23

What percentage of UMN cross laterally at the level of the medulla?

85%

24

If the UMN cross laterally at the level of the medulla what are they referred to as?

Lateral Corticospinal tract

25

If the UMN don't cross and descend ipsilateral to side of origin what are the UMN referred to as?

Anterior Corticspinal tract

26

Where do UMN of the anterior corticospinal tract cross over to synapse?

At level of synapse they cross over to the opposite anterior horn to join the lateral corticospinal tract.

27

Once synapsed where do both the lateral and anterior corticospinal tracts exit the spinal column?

From the anterior horn.

28

What is the function of the Tectospinal Tract?

Mediate reflex head and neck movement due to visual stimuli

29

What is the function of the Reticulospinal tract?

Influences voluntary movement

30

What is the function of the Vestibulospinal tract?

Excitatory input to antigravity extensor muscles