Cranial nerves

Question 1

Which 2 cranial nerves originate from the cerebrum

Answer 1

CN I - Olfactory nerve
CN II - Optic nerve

Question 2

Which CN arises from the midbrain

Answer 2

Trochlear nerve - CN VI

Question 3

Which CN has the longest intracranial course

Answer 3

Trochlear nerve - CN IV

Question 4

Which CN arises from the midbrain pontine junction

Answer 4

Oculomotor nerve - CN III

Question 5

Which CN arises from the pons

Answer 5

Trigeminal nerve - CN V

Question 6

Which CN arises from the pontine medulla junction

Answer 6

Abducens, facial, and vestibulocochlear (CN VI-VIII)

Question 7

Which CN arise from the medulla posterior to the olive

Answer 7

Glossopharyngeal, vagus and accessory nerve (CN IX-XI)

Question 8

Which CN arise from the medulla anterior to the olive

Answer 8

Hypoglossal nerve (CN XII)

Question 9

A lesion in the temporal lobe would give what visual field defect

Answer 9

Superior homonymous quadratonopia

Question 10

A lesion in the parietal lobe would give what visual field defect

Answer 10

Inferior homonymous quadratonopia

Question 11

A pituitary adenoma compressing the optic chiasm would give which visual field defect

Answer 11

Bitemporal hemianopia

Question 12

What are the common causes of an oculomotor nerve palsy

Answer 12

Raised intracranial pressure (compresses the nerve against the temporal bone)
Posterior communicating artery aneurysm
Cavernous sinus infection or trauma

Question 13

What modalities does the oculomotor nerve carry

Answer 13

Motor
Parasympathetic

Question 14

The trigeminal nerve is associated with derivatives of which pharyngeal arch

Answer 14

1st

Question 15

Inferior alveolar nerve block is utilised when undertaking what procedures

Answer 15

Dental procedures

Question 16

Which CN travels in Dorellos canal

Answer 16

Abducens nerve (CN VI)

Question 17

The facial nerve is associated with derivatives of which pharyngeal arch

Answer 17

2nd

Question 18

What are the first 3 branches of the facial nerve

Answer 18

Greater petrosal nerve
Nerve to stapedius
Chorda tympani

Question 19

What are the terminal 5 branches of the facial nerve and where does it divide into them

Answer 19

Temporal, Zygomatic, Buccal, Marginal mandibular, cervical
Divides within the parotid gland

Question 20

Which nerve is at risk of damage in a basal skull fracture

Answer 20

Vestibulocochlear nerve (CN VIII)

Question 21

Which muscles of the pharynx does glossopharyngeal nerve innervate

Answer 21

Stylopharyngeus

Question 22

The vagus nerve is associated with derivatives of which pharyngeal arches

Answer 22

4th and 6th

Question 23

Which branches of the vagus nerve arise in the neck

Answer 23

Pharyngeal branches
Superior laryngeal nerve
Recurrent laryngeal nerve

Question 24

How does the path of the recurrent laryngeal nerve differ on the right and left

Answer 24

Right recurrent laryngeal nerve - hooks under the subclavian artery
Left recurrent laryngeal nerve - hooks under the arch of the aorta

Question 25

All of the muscles of the larynx are innervated by the vagus nerve except for which

Answer 25

Stylopharyngeus

Innervated by glossopharyngeal nerve

Question 26

A unilateral recurrent laryngeal nerve lesion will cause which clinical features

Answer 26

Dysphonia

Question 27

Bilateral recurrent laryngeal nerve lesion will cause which clinical features

Answer 27

Aphonia (loss of voice)
Stridor

Question 28

What are the 2 muscles innervated by the spinal accessory nerve

Answer 28

Trapezius
Sternocleidomastoid

Question 29

From which spinal segments does the accessory nerve arise from

Answer 29

C1-C5/C6

Question 30

Why is the accessory nerve vulnerable to damage

Answer 30

It is found quite superficial
Runs between the investing and prevertebral layers of fascia

Question 31

The long course of the abducens nerve makes it vulnerable to what

Answer 31

Raised ICP