Cranial Nerves

Question 1

Name of Cranial Nerve 1

Answer 1

Olfactory

Question 2

Where does cranial nerve 1 originate?

Answer 2

Olfactory epithelium of caudal nasal mucosa

Question 3

Through which structure do the axons of cranial nerve 1 pass?

Answer 3

Cribiform plate

Question 4

Main function of cranial nerve 1

Answer 4

Sense of smell

Question 5

Name of Cranial Nerve 2

Answer 5

Optic

Question 6

Functions of cranial nerve 2

Answer 6

vision, pupil size, visual reflexes/responses

Question 7

Where do the neurons forming cranial nerve 2 originate?

Answer 7

Retina

Question 8

Through which structure in the eye do the axons of cranial nerve 2 exit?

Answer 8

Optic disc

Question 9

To which part of the brain is visual information relayed?

Answer 9

Occipital cortex

Question 10

Does CNN II control the sensory or motor aspect of the pupillary light reflex?

Answer 10

Sensory

Motor–> CNN III

Question 11

Is CNN II sensory or motor in the menace response?

Answer 11

Sensory

Motor–> CNN VII

Question 12

Which 3 cranial nerves are involved with eye movement?

Answer 12

III, IV, VI

Question 13

Which muscle(s) is CNN III responsible for moving around the eye?

Answer 13

DMV rectus, ventral oblique, and levator palpebrae superioris

Question 14

Which muscle(s) is CNN IV responsible for moving around the eye?

Answer 14

Dorsal oblique

Question 15

Which muscle(s) is CNN VI responsible for moving around the eye?

Answer 15

Lateral rectus, retractor bulbi

Question 16

Strabismus

Answer 16

altered eye position; seen with nerve dysfunction

Question 17

Name of CNN III

Answer 17

Oculomotor

Question 18

Origin of CNN III

Answer 18

Brainstem

Question 19

Functions of CNN III

Answer 19

motor innervation to extraocular muscles and constrictor muscle of the pupil

Question 20

Which of the cranial nerves are parasympathetic?

Answer 20

III, VII, IX, X

Question 21

Name of CNN IV

Answer 21

Trochlear

Question 22

Main function of CNN IV

Answer 22

mov’t of eye muscles (Dorsal oblique)

Question 23

Name of CNN V

Answer 23

Trigeminal

Question 24

Main functions of CNN V (sensory and motor)

Answer 24

Sensory: face, eye, mouth
Motor: muscles of mastication

Question 25

What are the three main branches of CNN V. Which are sensory and/or motor?

Answer 25

1) Opthalmic (sensory)
2) Maxillary (sensory)
3) Mandibular (sensory and motor)

Question 26

Name of CNN VII

Answer 26

Facial

Question 27

Functions of CNN VII

Answer 27

1) motor to muscles of facial expression (menace response)
2) sensory to inner pinna of ear
3) Taste rostral 2/3 tongue
4) Parasympathetic to lacrimal and salivary glands

Question 28

Name of CNN VIII

Answer 28

Vestibulocochlear

Question 29

Functions of CNN VIII

Answer 29

Balance and hearing

Question 30

Name of CNN IX

Answer 30

Glossopharyngeal

Question 31

Functions of CNN IX

Answer 31

1) sensory and motor to pharynx (gag response)
2) sensory to caudle 1/3 tongue
3) Carotid sinus (baroreceptors) and carotid body (chemorecptors)
4) parasympathetic to salivary glands

Question 32

Name of CNN X

Answer 32

Vagus

Question 33

Functions of CNN X

Answer 33

1) sensory and motor to pharynx (gag reflex)
2) sensory to viscera
3) Parasympathetic to viscera
4) carries recurrent laryngeal
5) carries cranial laryngeal

Question 34

What nerve does the recurrent larygeal become?

Answer 34

Caudal laryngeal

Question 35

Which muscle of the larynx does the caudal largyneal NOT supply?

Answer 35

cricothyroid

Question 36

Cricothyroid is supplied by what nerve?

Answer 36

Cranial laryngeal

Question 37

What muscle functions to open the glottis? What never supplies it?

Answer 37

Cricoarytenoideus; caudal laryngeal nerve

Question 38

Name of CNN XI

Answer 38

Accessory

Question 39

Functions of CNN XI

Answer 39

Motor to trapezius and other neck muscles

Question 40

Name of CNN XII

Answer 40

Hypoglossal

Question 41

Functions of CNN XII

Answer 41

Motor to tongue muscles (both intrinsic and extrinsic)

Question 42

Which CNN exit through the orbital fissure?

Answer 42

III, IV, VI

Question 43

Which CNN exit through the tympano-occipital fissure?

Answer 43

IX, X, XI

Question 44

Menace response (sensory and motor)

Answer 44

S: II
M: VII

Question 45

Pupillary light reflex (PLR)

Answer 45

S: II
M: III

Question 46

Gag Reflex

Answer 46

S: IX
M: IX, X

Question 47

Corneal Reflex

Answer 47

S: V
M: VII, VI