Axonal transport and spinal tracts Flashcards Preview

Neuroscience Deja Review USMLE 1 > Axonal transport and spinal tracts > Flashcards

Flashcards in Axonal transport and spinal tracts Deck (31):
1

Name the cytoplasmic structure in the nerve cell body and dendrites that are involved in protein synthesis:

Nissl substance

2

Transport responsible for delivery of synthesized NTs away from the cell body

Fast anterograde axonal transport

3

Transport responsible for delivery of cytoskeletal and cytoplasmic components away from the cell body

Slow anterograde transport

4

Transport responsible for returning material to the cell body for degradation

Fast retrograde transport

5

Kinesin-dependent transport

Fast anterograde axonal transport

6

Dynein-dependent transport

Fast retrograde transport

7

Transport responsible for carrying nerve growth factor, viruses, and toxins to cell bodies

Fast retrograde transport

8

Name the process of anterograde axonal and myelin degeneration accompanied by Schwann cell proliferation:

Wallerian degeneration

9

What spinal tract is responsible for Voluntary control of skeletal muscle

Lateral corticospinal/pyramidal tract

10

What spinal tract is responsible for Sensation of pain and temperature

Lateral spinothalamic tract

11

What spinal tract is responsible for Two-point discrimination and vibratory sensation

Dorsal column-medial lemniscus tract

12

What spinal tract is responsible for Control of facial muscles

Corticobulbar tract

13

What spinal tract is responsible for Coordination of muscle tone, posture, balance, and motor activity

Dentothalamic tract

14

Describe the major difference between the innervation of the lower and upper facial muscles.

Corticobulbar fibers innervate the lower facial muscles unilaterally, while upper facial muscles are innervated bilaterally

15

Name the structure in the spinal cord composed of ascending fibers of the dorsal column-medial lemniscus pathway originating in the upper extremities:

Cuneate fasciculus

16

Name the structure in the spinal cord composed of ascending fibers of the dorsal column-medial lemniscus pathway originating in the lower extremities:

Gracile fasciculus (medial to cuneate fasciculus)

17

At what level of the brainstem do fibers of the dorsal column-medial lemniscus pathway cross?

Caudal medulla

18

What type of receptors provide input to the lateral spinothalamic tract?

Free nerve endings

19

At what level do fibers of the spinothalamic tract cross?

At the same level or 1 to 2 levels above/below where they enter the spinal cord

20

Name the structure where fibers of the lateral spinothalamic tract cross the midline:

Ventral white commissure/anterior commisure

21

Where do fibers of the dorsal column-medial lemniscus pathway, the trigeminothalamic, and lateral spinothalamic tract all terminate?

The sensory cortex (Brodmann areas 3, 1, and 2)

22

What part of the cortex gives rise to the fibers of the lateral corticospinal and corticobulbar tracts?

The motor, premotor, and sensory areas of the cortex (Brodmann areas 6, 4, and 3, 1, 2)

23

Fibers of the lateral corticospinal tract pass through which limb of the internal capsule?

Posterior limb

24

Name the structure where fibers of the lateral corticospinal tract cross the midline:

Medullary pyramids

25

UMN or LMN sign?
Spastic paresis

UMN

26

UMN or LMN sign?
Flaccid paralysis

LMN

27

UMN or LMN sign?
Babinski sign (upgoing toes)

UMN

28

UMN or LMN sign?
Fasciculations and fibrillations

LMN

29

UMN or LMN sign?
Areflexia

LMN

30

UMN or LMN sign?
Atrophy

LMN

31

UMN or LMN sign?
Hyperreflexia

UMN