Cranial Nerves

Question 1

Cranial Nerve I

Answer 1

Olfactory

Question 2

Cranial Nerve II

Answer 2

Optic

Question 3

Cranial Nerve III

Answer 3

Oculomotor

Question 4

Cranial Nerve IV

Answer 4

Trochlear

Question 5

Cranial Nerve V

Answer 5

Trigeminal

Question 6

Cranial Nerve VI

Answer 6

Abducens

Question 7

Cranial Nerve VII

Answer 7

Facial

Question 8

Cranial Nerve VIII

Answer 8

Vestibulocochlear

Question 9

Cranial Nerve IX

Answer 9

Glossopharyngeal

Question 10

Cranial Nerve X

Answer 10

Vagus

Question 11

Cranial Nerve XI

Answer 11

Accessory

Question 12

Cranial Nerve XII

Answer 12

Hypoglossal

Question 13

Cranial Nerve Exam:
Menace

Answer 13

CN II, VII, thalamocortex, cerebellum

Question 14

Cranial Nerve Exam:
Symmetry pupils and PLR

Answer 14

CN II, III

Question 15

Cranial Nerve Exam:
Oculocephalic reflex

Answer 15

CN III, IV, VI, VIII, medial longitudinal fasciculus (MLF)

Question 16

Cranial Nerve Exam:
Palpebral reflex

Answer 16

CN V, VII

Question 17

Cranial Nerve Exam:
Nasal sensation

Answer 17

Thalamocortex, CN V (sen)

Question 18

Cranial Nerve Exam:
Muscles mastication

Answer 18

CN V motor

Question 19

Cranial Nerve Exam:
Facial expression

Answer 19

CN VII motor (most of the time is the upper lip that is droopy)

Question 20

What nerves do “hands-on” cranial nerve exam tests?

Answer 20

CN II - CN VIII

Question 21

A 10 year old female spayed Labrador retriever dog is presented to you with a 4-month history of progressive atrophy of the muscles of the left side of the head/face. On neurologic examination, you find severe atrophy of the left temporalis, masseter and digastricus muscles, as well as decreased nasal sensation and corneal sensation on the left. The remainder of the neurologic examination is normal. The most likely diagnosis is:

Answer 21

Trigeminal nerve sheath tumor

Question 22

What is the function of cranial nerve VII (facial nerve)?

Answer 22

Motor to the muscles of facial expression

Question 23

Cranial nerve VI (Abducens) innervates which of the following muscles?

Answer 23

Retractor bulbi