Lecture 10- Spinal Cord 2

Question 0

What are the 3 types of intra spinal/propriospinal fibers?

Answer 0

Comissural- Ant. White Commissure

Interspinal- Lissauer’s Tract
Intraspinal- Fasiculis Proprius

Question 1

How do degenerating pathways present on a myelin stain?

Answer 1

Pale regions

Question 2

What type of information is carried in Lissauer’s tract?

Answer 2

Pain and temperature

Question 3

What is another name for an alpha motor neurons?

Answer 3

Anterior horn neurons

Question 4

What is the difference between the Fasciculus cuneatus and Fasciculus gracilis?

Answer 4

Cuneatus- above T6- nucleus cuneatus to VPL

Gracilis- below T6- nucleus gracilis to VPL

Question 5

Which sensory pathway is found in the anterior/ventral spinal cord?

Answer 5

Anterolateral system

Question 6

List the 5 pathways that are a part of the anterolateral system.

Answer 6

1. Neospinalthalamic tract
2. Paleospinalthalamic tract
3. Anterior Spinothalamic tract
4. Spinomesencephalic tract
5. Spinoreticular tract

Question 7

What is the function of the dorsal column/medial lemniscus system?

Answer 7

Fine touch
Pressure
Vibration
Position

Question 8

Where do fibers cross in the dorsal column system?

Answer 8

Cross at medulla to form medial lemniscus

Question 9

Where is the VPL located?

Answer 9

Ventroposterolateral nucleus of thalamus

Question 10

What are the functions of the 5 pathways of the anterolateral system?

Answer 10

4 pain

1 crude touch

Question 11

Where do pain pathways cross the midline?

Answer 11

At spinal level through the anterior white Commissure

Question 12

What is the function of the Neospinalthalamic tract?

Answer 12

fast Pain and temp

Question 13

What tract carries crude touch information?

Answer 13

Anterior Spinothalamic tract

Question 14

What does the dorsal spinocerebellar become above C8?

Answer 14

Cuneocerebellar tract

Question 15

What is the ventral spinocerebellar tract know as above C8?

Answer 15

Rostral spinocerebellar

Question 16

Where are the second order sensory neurons for the dorsal spinocerebellar tract below C8?

Answer 16

Nucleus Dorsalis of Clarke

Question 17

Where are the second order sensory neuron for the cuneocerebellar tract (above C8)?

Answer 17

External cuneate nucleus (caudal medulla)

Question 18

How does information from the dorsal and cuneocerebellar tracts cross into the cerebellum?

Answer 18

Via the inferior cerebellar peduncle

Question 19

How does information from the ventral and rostral cerebellar tracts enter the cerebellum?

Answer 19

Via the superior cerebellar peduncle

Question 20

Which of the ALS pathway can project bilaterally?

Answer 20

Anterior Spinothalamic tract

Question 21

Which of the spinocerebellar tracts crosses twice?

Answer 21

Ventral spinocerebellar tract

Question 22

Where are the second order neurons located for the ventral and rostral spinocerebellar tracts?

Answer 22

Spinal border cells (lamina V-VII)

Question 23

What is the function of the ventral/rostral spinocerebellar tract?

Answer 23

Info about entire limbs-muscle sense

Question 24

What is the function of the dorsal and cuneocerebellar tracts?

Answer 24

Individual muscle sense

Question 25

What is tabis dorsalis?

Answer 25

Cause by sphyllis-death of cells in dorsal column-loss of sensation in affected area

Question 26

Where do the lateral and anterior corticospinal tracts originate?

Answer 26

Motor and pre motor cortex in pre-central gyrus of the frontal lobe

Question 27

Where is the pre-motor cortex? What pathways originate here?

Answer 27

Frontal lobe | Origination of the lateral and anterior corticospinal tracts

Question 28

Where do the fibers of the lateral corticospinal tract decussate?

Answer 28

Pyramidal decussation in the caudal medulla

Question 30

Where do they anterior corticospinal tract fibers decussate?

Answer 30

They cross at their target segment rather than in pyramids

Question 31

Where are the 3rd neurons of the paleospinothalmic (part of ALS) located? Where do they project?

Answer 31

intralaminar nucleus of the thalamus project to the cingulate cortex

Question 32

Which pathway terminates in the cinguate cortex?

Answer 32

Paleospinothalamic tract (part of ALS)- Dull pain

Question 33

How are the Neospinothalamic and Paleospinothalamic pathways different?

Answer 33

Neo- sharp, well localized pain, VPL-> somatosensory cortex Paleo- dull, diffuse pain, intralaminar nucleus--> cingulate cortex

Question 34

What is polio?

Answer 34

a neurodegenerative disease of the anterior horn neurons

Question 35

What is Brown-Sequard syndrome? What does it result in?

Answer 35

Complete hemisection of spinal cord -Results in loss of sensation on affected side and loss of motor ability on opposite side

Question 36

Where does the rubrospinal tract originate?

Answer 36

Red Nucleus of the midbrain

Question 37

Where do the fibers of the rubrospinal tract cross?

Answer 37

VTD- Ventral Tegmental Decussation in midbrain

Question 38

Which muscles does the rubrospinal tract preferentially affect?

Answer 38

muscles of distal flexor muscles

Question 39

What is the function of the raphespinal tract?

Answer 39

modulate pain in the spinal cord

Question 40

What is the tectospinal tract involved in?

Answer 40

moves head in response to visa stimuli

Question 41

Where does the tectospinal tract originate?

Answer 41

superior colliculus of the midbrain

Question 42

Which tract mediates posture and balance by acting on distal extensor muscles?

Answer 42

Lateral Vestibulospinal Tract

Question 43

Which spinal tract is involved in maintaining head position in response to vestibular information?

Answer 43

Medial Vestibulospinal Tract

Question 44

What is the Medial Vestibulospinal tract known as in the brainstem?

Answer 44

MLF- Median Longitudinal Fasiculus

Question 45

Where does the Medial Vestibulospinal Tract project to?

Answer 45

interneurons in lamina VIII and IX at the CERVICAL LEVELS