Cranial nerves

Question 1

Which cranial nerve is responsible for shoulder elevation and head turning?

Answer 1

Cranial Nerve XI. Accessory spinal nerve

Question 2

Cranial nerves responsible for eye movement

Answer 2

III, IV and VI

Question 3

3 branches of the largest cranial nerve

Answer 3

Ophthalmic, maxillary and Mandibular

Question 4

Cranial nerves involved in taste

Answer 4

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.
The Vagus (CN X) nerve senses taste from the extreme posterior.

Question 5

Cranial nerve involved in lateral rectus palsy

Answer 5

Abducens:
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 6

Cranial nerve VIII?

Answer 6

Vestibulocochlear: Hearing and Balance

Question 7

Cranial nerve III?

Answer 7

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 8

Cranial nerve for tongue movement but not taste

Answer 8

CN XII; Hypoglossal nerve

Question 9

Controls rotating the eye towards the nose & moving the eye downward

Answer 9

Trochlear

Question 10

Partially controls taste & some muscles used for swallowing. Taste perception: posterior ⅓ of the tongue (lingual branch)

Answer 10

Glossopharyngeal (CN IX)

Question 11

Taste from posterior 1/3 of tongue, swallowing, salivation (parotid gland),
monitoring carotid body and sinus chemo- and baroreceptors.

Answer 11

Glossopharyngeal (CN IX)

Question 12

Vagus nerve

Answer 12

Taste from epiglottic region, swallowing, palate elevation, talking,
thoracoabdominal viscera, monitoring aortic arch chemo- and baroreceptors.

Question 13

Involved in controlling heart rate, speech, digestion, and sweating

Answer 13

Vagus nerve

Question 14

Involved in lacrimation (producing tears)

Answer 14

Facial nerve

Question 15

Which of the following cranial nerves is involved in getting the lens of the eye to focus on an object?

Answer 15

Oculomotor

Question 16

Cranial nerve involved in blinking reflex

Answer 16

Oculomotor

Question 17

Cranial nerve responsible for motor component of gag reflex

Answer 17

Vagus nerve

Question 18

CN responsible for sensory component of gag reflex

Answer 18

Glossopharyngeal

Question 19

CNVI innervates what muscle

Answer 19

Lateral rectus

Question 20

Eye abduction CN

Answer 20

CNVI

Question 21

CNVI palsy

Answer 21

Caused by microvascular ischemia
Often occurs in association with poorly controlled diabetes or hypertension

Horizontal diplopia that improves with losing affected eye
Inability to move affected eye laterally (look outward)

Question 22

CNIV palsy

Answer 22

Diplopia, outward tilt to affected eye
Tilt head away from affected side to compensate
Problems with reading and walking down stairs (down and in activities)

Question 23

CNIII palsy

Answer 23

ptosis, dilated pupils, eyes down and out (abducted and depressed)

Question 24

Which CN is efferent limb of Corneal reflex

Answer 24

facial nerve

Question 25

CNVII paralysis

Answer 25

Facial paralysis,
loss of test to anterior 2/3 of tongue,
hyperacusis,
abnormal corneal reflex

Question 26

sensory limb of corneal reflex

Answer 26

V1 of CNV

Question 27

CNVII palsy

Answer 27

lack of tearing
Inability to close the eye or move the forehead
sagging of eyebrow
abnormal smile/frown

Question 28

cochlear lesion?

Answer 28

Tinnitus and hearing loss

Question 29

Vestibular lesion?

Answer 29

Nystagmus and vertigo

Question 30

Accessory nerve palsy?

Answer 30

shoulder droop, impaired shoulder abduction

difficulty turning their head away from affected side