Cranial Nerve Exam

Question 1

What is the pathway for a reflex?

Answer 1

afferent nerve, spinal cord/brain stem, efferent nerve

Question 2

What is the pathway for a response?

Answer 2

afferent nerve, cortex of the brain for perception, initiation of movement by cortex, efferent nerve

Question 3

What is CN I?

Answer 3

Olfactory n.

Question 4

How can you test CN I?

Answer 4

offer smelly treat without visualization

Question 5

What is CN II?

Answer 5

Optic

Question 6

T/F. the optic n. is both sensory and motor.

Answer 6

F. sensory only

Question 7

What would happen if CN II is damaged

Answer 7

blindness

Question 8

What are 5 tests used to test CN2?

Answer 8

1. pupillary light reflex
2. menace response
3. visual placement reaction
4. obstacle course
5. tracking

Question 9

What nerve do you also test when using PLR to test CN 2?

Answer 9

CN3

Question 10

What two nerves do you test when testing a dogs menice response

Answer 10

CN 2 and 7

Question 11

What if you see a normal menace response but PLR is negative?

Answer 11

Damage to CN 3

Question 12

What is CN3?

Answer 12

Oculomotor

Question 13

Which mm. of the eye are innervated by CN3?

Answer 13

Rectus m.
ventral oblique m.
pupil

Question 14

Where does the oculomotor n. exit the skull?

Answer 14

orbital fissure

Question 15

how can you test for CN3 damage?

Answer 15

1. check for normal eye position
2. check for normal uppereyelid position
3. PLR
4. lesions?

Question 16

Static deviation of the affected eye

Answer 16

strabismus

Question 17

drooping of the superior eyelid

Answer 17

ptosis

Question 18

What is CN IV

Answer 18

Trochlear

Question 19

Which m. does CN4 innervate?

Answer 19

dorsal oblique

Question 20

Where does CN4 exit the skull?

Answer 20

Orbital fissure

Question 21

How can you test CN4?

Answer 21

1. abnormal rotation
2. normal congruent eye movement
3. strabismus

Question 22

What are the 3 braches of CN5?

Answer 22

1. ophthalmic
2. maxillary
3. mandibular

Question 23

What is CN5?

Answer 23

Trigeminal

Question 24

Which branch of the trigeminal n. is sensory to the lateral canthus?

Answer 24

maxillary

Question 25

What branch of the trigeminal n. is sensory to the medial canthus?

Answer 25

ophthalmic

Question 26

What is the afferent CN in the palpebral test?

Answer 26

trigeminal

Question 27

What is the efferent CN being tested when pinching the upper lip/cheak and observing the dog wrinkling its nose?

Answer 27

Facial

Question 28

What is CN6?

Answer 28

Abducens

Question 29

What two muscles are innervated by the abducens?

Answer 29

Lateral rectus | Retractor bulbi m.

Question 30

How can you test CN6?

Answer 30

look for normal eye movement and position

Question 31

If you touch the cornea and do not see the 3rd eyelid sweep over, which n is damaged?

Answer 31

CN6

Question 32

Which 3 nn. are responsible for producing coordinated movement of the eyes?

Answer 32

1. CN3 2. CN5 3. CN6

Question 33

What is CN7?

Answer 33

Facial

Question 34

How does CN7 leave the dkull?

Answer 34

stylomastoid foramen

Question 35

T/F. CN7 is both sensary and motor?

Answer 35

t

Question 36

How can you test the facial n.?

Answer 36

facial symmetry

Question 37

What are 3 indicators of CN7 damage?

Answer 37

1. dec. palpebral reflex 2. dec. menace resp. 3. dec. response to pinching of upper or lower lip

Question 38

How can you test the PSNS portion of the facial n.?

Answer 38

tear production amt.

Question 39

What is the PSNS of CN2?

Answer 39

salivary and lacrimal glands

Question 40

What is CN8?

Answer 40

Vestibulocochlear n.

Question 41

What n. functions in hearing and balance

Answer 41

cn8

Question 42

What would you see if CN8 is damaged?

Answer 42

1. dec. hearing 2. head tilt 3. circling 4. nystagmus

Question 43

A dog comes to you presenting with head tilt due to a lesion to CN8. is his head tilted toward or away from the lesion?

Answer 43

toward

Question 44

What is CN9?

Answer 44

Glossopharyngeal

Question 45

CN9 sensory to the ___

Answer 45

Tongue and pharyngeal mucosa

Question 46

CN9 motor to the ____

Answer 46

Pharynx

Question 47

CN9 PSNS to the ___

Answer 47

Salivary gland

Question 48

Where does CN9 exit the skull

Answer 48

Tympanooccipital fissure

Question 49

How can you test CN9?

Answer 49

1. give treat | 2. gag reflex

Question 50

What is CN 10?

Answer 50

Vagus

Question 51

Sensory of CN10?

Answer 51

epiglottis, ear canal, pharynx, larynx, trachea, esophagus

Question 52

PSNS of CN10?

Answer 52

Heart, lungs, abdominal viscera

Question 53

Motor of CN10?

Answer 53

Pharynx and esophagus

Question 54

how does CN10 exit the skull

Answer 54

Tympanooccipital fissure

Question 55

What is CN11

Answer 55

Accessory n.

Question 56

What mm. are innervated by CN11?

Answer 56

Sternocephalicus cleidocephalicus trapezius Omotransversarius

Question 57

What n. branches off CN11

Answer 57

recurrent laryngeal n.

Question 58

What is the terminal branch of the recurrent laryngeal n.

Answer 58

Caudal laryngeal

Question 59

What is the only muscle that open the glottis?

Answer 59

Cricoarytenoidus dorsalis

Question 60

How does CN 11 exit the skull?

Answer 60

tympanooccipital fissure

Question 61

What would you observe if CN11 is damaged?

Answer 61

1. gait change 2. altered head and neck movement 3. laryngeal paralysis (roarers)

Question 62

What is CN12?

Answer 62

Hypoglossal

Question 63

How does CN12 exit the skull?

Answer 63

hypoglossal canal

Question 64

What would you observe if CN12 was damaged?

Answer 64

Difficulty eating tongue offset on unaffected side dec tongue tone