Cranial Nerves & Reflexes Flashcards

1
Q

Are Efferent fibers:

Motor or Sensory?

A

Motor

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Are Afferent fibers:

Motor or Sensory?

A

Sensory

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

How many pairs of cranial nerves are there?

A

12 pairs

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

All cranial nerves distribute to the head and neck except 1…which 1?

A

CN X: Vagus

Goes to thorax and abdomen

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Which cranial nerves are pure sensory and carry special senses?

A

1, 2, 8

  • CN I: Olfactory
  • CN II: Optic
  • CN VIII: Vestibulocochlear

**smell, vision, hearing and equilibrium**

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Which cranial nerves are pure motor and control extraocular eye movements?

A

3, 4, 6

  • CN III: Oculomotor
  • CN IV: Trochlear
  • CN VI: Abducens
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Which cranial nerves are pure motor and innervate the SCMs, traps and tongue?

A

11 & 12

  • CN XI: Accessory
  • CN XII: Hypoglossal
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Which cranial nerves are MIXED sensory and motor?

A

5, 7, 9, 10

  • CN V: Trigeminal
  • CN VII: Facial
  • CN IX: Glossopharyngeal
  • CN X: Vagus
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What does CN I do?

A

CN I: Olfactory

Smell

(pure sensory)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What does CN II do?

A

CN II: Optic

Vision

(pure sensory)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What do CN II & III do?

A

Pupillary Reflexes

  • CN II: Optic (sensory)
  • CN III: Oculomotor (motor)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What do CN III, IV, & VI do?

A

Extraocular movements

  • CN III: Oculomotor - turns eyes up, down, in

Elevates eye lid

  • CN IV: Trochlear - turns adducted eye down
  • CN VI: Abducens - turns eye out
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What does CN V do?

A

Sensory: Face, cornea

Motor: Temporal and masseter muscles

  • CN V: Trigeminal
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What does CN VII do?

A

Facial Expression

  • CN VII: Facial
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What does CN VIII do?

A

Vestibular function

Test eye-head coordination, VOR

Cochlear function

  • CN VIII: Vestibulocochlear
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What do CN IX & X do?

A

Phonation (voice quality)

Swallowing

Palatal, pharynx control

Gag Reflex

  • CN IX: Glossopharyngeal
  • CN X: Vagus
17
Q

What does CN XI do?

A

Trap and SCM muscle function

  • CN XI: Accessory nerve
18
Q

What does CN XII do?

A

Tongue movements

  • CN XII: Hypoglossal
19
Q

What is a dermatome?

A

specific segmental skin area innervated by sensory spinal axons

20
Q

What is a myotome?

A

skeletal muscles innervated by motor axons in a given spinal root

21
Q

In the cervical spine, do numbered roots exit above or below the corresponding vertebral body?

A

Above

(C8 nerve root exits below C7 vertebral body)

22
Q

In the thoracic, lumbar and sacral spine, do numbered roots exit above or below the corresponding vertebral body?

23
Q

At what level does the spinal cord end?

24
Q

What are the nerve roots called in the lumbosacral region?

A

Cauda Equina

25
What is the function of the stretch reflex?
Stimulus: Muscle Stretch * Maintenance of muscle tone * Support agonist muscle contraction * Provide feedback about muscle length
26
What is reciprocal inhibition?
stretch stimulus inhibits antagonist muscle
27
What is reciprocal innervation?
Stretch stimulus on agonist (autogenic facilitation), antagonist (reciprocal inhibition), and synergistic muscles (facilitation).
28
What is the function of the inverse stretch reflex?
Stimulus Muscle contraction * Provide agonist inhibition * Diminution of force of agonist contraction * Stretch-protect reflex
29
What is the function of the Gamma Reflex loop?
Allows muscle tension to come under control of descending pathways (reticulospinal, vestibulospinal, and others)
30
What is the function of the flexor withdrawal reflex?
Stimulus: Cutaneous sensory stimuli * Protective withdrawal mechanism to remove body part from harmful stimuli
31
What is the function of the crossed extension reflex?
Stimulus: Noxious stimuli and reciprocal action of antagonists * Flexors excited on one side cause other side to inhibit * Coordinates reciprocal limb activities such as gait
32
What spinal level does deep tendon reflexing testing test at the: Biceps tendon
C5-C6
33
What spinal level does deep tendon reflexing testing test at the: Brachioradialis tendon
C5-C6
34
What spinal level does deep tendon reflexing testing test at the: Triceps tendon
C6-C7
35
What spinal level does deep tendon reflexing testing test at the: Patellar tendon
L3-L4
36
What spinal level does deep tendon reflexing testing test at the: Achilles tendon
S1-S2