Pathways

Question 1

What are the three ascending pathways?

Answer 1

DCML
Spinothalamic tract
Spinocerebellar pathway

Question 2

What are the 3 functions of the DCML?

Answer 2

Fine touch
Proprioception
Vibration

Question 3

What does DCML stand for?

Answer 3

Dorsal column-medial lemniscus

Question 4

Where does the DCML desiccate?

Answer 4

Medulla

Question 5

What are the two components of the DCML?

Answer 5

Nucleus cuneatus

Nucleus Gracillis

Question 6

To which somatosensory cortex is the information transmitted to?

Answer 6

CONTRALATERAL

Question 7

Function of the spinothalamic tract

Answer 7

Lateral- Pain and temperature

Anterior- Crude touch

Question 8

Where do the two conscious ascending pathways of the brain enter the spinal cord?

Answer 8

The posterior root ganglia

Question 9

Where does the spinothalmaic tract cross over?

Answer 9

1 or 2 spinal segments above through tract of lissauer to synapse in the dorsal horn

Question 10

At what level does the spinothalamic tract dessucate?

Answer 10

Spinal level

Question 11

Which somatosensory cortex is the information in the spinothalamic tract transmitted to?

Answer 11

Contralateral

Question 12

What is the name of the pathways that carries unconscious proprioceptive information to the cerebellum

Answer 12

Spinocerebellar pathways

Question 13

What two things does the spinocerebellar pathway coordinate?

Answer 13

Movement and posture

Question 14

What are the 3 types of spinocerebellar pathway

Answer 14

Dorsal/posterior spinocerebellar
Cuneocerebellar
Ventral/Anterior spinocerebellar

Question 15

Where does the dorsal/posterior spinocerebellar tract carry information from?

Answer 15

the lower limbs

Question 16

Where does the dorsal/posterior spinocerebellar tract synapse?

Answer 16

dorsal nucleus of Clarke

Question 17

Where does the cuneocerebellar carry unconscious proprioceptive information from

Answer 17

The upper limbs

Question 18

Where does the ventral/anterior spinocerebellar pathways carry unconscious proprioceptive information from?

Answer 18

The lower limbs (Golgi tendon organs mainly)

Question 19

The spinocerebellar pathway transmits information to which somatosensory cortex?

Answer 19

Ipsilateral

Question 20

Conscious pathways have a —– neuron chain?

Answer 20

3

Question 21

What are the names of the two pyramidal descending pathways?

Answer 21

Corticospinal

Corticobulbar

Question 22

Corticospinal conveys voluntary skilled movements from the cortices to the ——– of the medulla

Answer 22

pyramids

Question 23

85% of the fibres of the corticospinal tract cross in the medulla and form the ——-

Answer 23

lateral CST

Question 24

What does the lateral CST carry?

Answer 24

Motor information for limb

Question 25

Uncrossed fibres of the corticospinal tract form the -------

Answer 25

Ventral CST

Question 26

What does the ventral CST carry?

Answer 26

Motor information for central

Question 27

If there is a CVA of the internal capsule there will be a lack of descending controls of the corticospinal tract. What does this clinically look like?

Answer 27

Spastic paralysis and hyperflexion of the upper limbs (Decorticate posturing)

Question 28

TRUE/FALSE Corticobulbar provides motor to the CN that supply the face

Answer 28

TRUE

Question 29

What are the CN that supply the face?

Answer 29

V,VII,X,XII

Question 30

Most inputs from the corticobulbar are bilateral. Which two nerves are innervated contraleterally only?

Answer 30

Lower facial nerve | Hypoglossal nerve

Question 31

UMN lesions affecting facial nerve clinically looks like...

Answer 31

paralysis to lower side of one half of the face ONLY and forehead unaffected (central facial palsy)

Question 32

A LMN lesion affecting the face clinically looks like... and is called

Answer 32

Paralysis of the ipsilateral one-half of the face inc forehead (Bells palsy)

Question 33

What are the 4 extrapyramidal tracts called?

Answer 33

Rubrospinal Vestibulospinal Rectospinal Tecto-spinal tracts

Question 34

Where do Rubrospinal tract originate?

Answer 34

Red nucleus

Question 35

What is the rubrospinal tract responsible for

Answer 35

limb flexors (and inhibit extensors)

Question 36

What do the fibres in the vestibulospinal tract control?

Answer 36

Balance and posture by innervating anti-gravity muscles

Question 37

Where does the tectonic-spinal tract originate?

Answer 37

Superior colliculus

Question 38

If there is a lesion above the midbrain which of the extrapyramidal tracts will be working

Answer 38

rubrospinal | reticulospinal