Cranial Nerves & Reflexes Flashcards Preview

NPTE Neuro > Cranial Nerves & Reflexes > Flashcards

Flashcards in Cranial Nerves & Reflexes Deck (36)
Loading flashcards...
1

Are Efferent fibers:

Motor or Sensory?

Motor

2

Are Afferent fibers:

Motor or Sensory?

Sensory

3

How many pairs of cranial nerves are there?

12 pairs

4

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

CN X: Vagus

Goes to thorax and abdomen 

5

Which cranial nerves are pure sensory and carry special senses?

1, 2, 8

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

**smell, vision, hearing and equilibrium**

6

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

3, 4, 6

  • CN III: Oculomotor
  • CN IV: Trochlear
  • CN VI: Abducens

7

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

11 & 12

  • CN XI: Accessory
  • CN XII: Hypoglossal

8

Which cranial nerves are MIXED sensory and motor?

5, 7, 9, 10

  • CN V: Trigeminal
  • CN VII: Facial
  • CN IX: Glossopharyngeal
  • CN X: Vagus

9

What does CN I do?

CN I: Olfactory

Smell

(pure sensory)

10

What does CN II do?

CN II: Optic

Vision

(pure sensory)

11

What do CN II & III do?

Pupillary Reflexes

  • CN II: Optic (sensory)
  • CN III: Oculomotor (motor)

 

12

What do CN III, IV, & VI do?

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

13

What does CN V do?

Sensory: Face, cornea

Motor: Temporal and masseter muscles

  • CN V: Trigeminal

14

What does CN VII do?

Facial Expression

  • CN VII: Facial

15

What does CN VIII do?

Vestibular function

Test eye-head coordination, VOR

Cochlear function

  • CN VIII: Vestibulocochlear

16

What do CN IX & X do?

Phonation (voice quality)

Swallowing

Palatal, pharynx control

Gag Reflex

  • CN IX: Glossopharyngeal
  • CN X: Vagus

17

What does CN XI do?

Trap and SCM muscle function

  • CN XI: Accessory nerve

18

What does CN XII do?

Tongue movements

  • CN XII: Hypoglossal

19

What is a dermatome?

specific segmental skin area innervated by sensory spinal axons

20

What is a myotome?

skeletal muscles innervated by motor axons in a given spinal root

21

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

Above

(C8 nerve root exits below C7 vertebral body)

22

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

Below

23

At what level does the spinal cord end?

L1

24

What are the nerve roots called in the lumbosacral region?

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