Cranial Nerve Function Quiz

Cranial Nerve Functions Quiz

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Question 1

A patient presents with concerns about his vision. He states that he is experiencing double vision. Upon evaluation you conclude that he has lateral rectus palsy. Which cranial nerve is most likely lesioned in this young man?

A	Abducens
B	Occulomotor
C	Trochlear
D	Trigeminal

Question 1 Explanation:

The lateral rectus muscle is innervated by CN VI (abducens nerve). Remember "LR6 SO4 the rest 3". (Lateral rectus innervated by CN VI, Superior oblique innervated by CN IV, the rest of the eye muscles are controlled by CN III)

Question 2

Which cranial nerve is responsible for sight?

A	CN II
B	Trochlear
C	Cranial nerve four
D	Oculomotor nerve

Question 2 Explanation:

CN II is the optic nerve. The optic nerve is responsible for eye sight.

Question 3

What is the responsibility of the hypoglossal nerve?

A	Controls tongue movement
B	Taste of the anterior 2/3 of the tongue
C	Taste of the posterior 1/3 of the tongue
D	Taste of the extreme posterior portion of the tongue

Question 3 Explanation:

The hypoglossal nerve (CN XII) is not involved in taste, but is involved in tongue movement.

Question 4

A 23 year old female presents complaining of hearing changes and balance issues. Which cranial nerve is most likely involved with her problems?

A	CN IX
B	CN XI
C	CN VIII
D	CN V

Question 4 Explanation:

CN VIII is the vestibulocochlear nerve which is involved in balance and hearing.

Question 5

What function is associated with the oculomotor nerve?

A	Eyesight
B	Eye movement and pupil constriction
C	Eye movement via the lateral rectus
D	Eye movement via the superior oblique

Question 5 Explanation:

The oculomotor nerve (CN III) is responsible for controlling the superior rectus, inferior rectus, medial rectus, and inferior oblique muscles of the eye. It is also involved in controlling the levator palpebrae muscle for opening the eyelid. CN III is also used to control pupil constriction and accommodation.

Question 6

Which cranial nerve is responsible for smell?

A	Trigeminal maxillary division
B	Trochlear
C	Olfactory
D	Accessory

Question 6 Explanation:

The Olfactory nerve is responsible for smell.

Question 7

A middle aged man expresses to you that he is concerned that he cannot taste anything on the anterior portion of his tongue. What nerve innervates this portion of the tongue?

A	Glossopharyngeal nerve
B	Hypoglossal nerve
C	Facial nerve
D	Trigeminal nerve

Question 7 Explanation:

The facial nerve (CN VII) senses taste from the anterior 2/3 of the tongue. The Glossopharyngeal nerve (CN IX) does the posterior 1/3, and the Vagus (CN X) nerve senses taste from the extreme posterior.

Question 8

Which cranial nerve innervates the muscles involved in shoulder shrugging and in turning the head?

A	CN XII
B	Abducens
C	CN X
D	Accessory
E	CN IV

Question 8 Explanation:

The accessory nerve (CN XI) innervates the sternocleidomastoid and the trapezius muscles.

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There are 8 questions to complete.