Cranial Nerves

Question 1

Name Cranial Nerve 1

Answer 1

Olfactory Nerve

Question 2

Name Cranial Nerve 2

Answer 2

Optic Nerve

Question 3

Name Cranial Nerve 3

Answer 3

Oculomotor Nerve

Question 4

Name Cranial Nerve 4

Answer 4

Trochlear Nerve

Question 5

Name Cranial Nerve 5

Answer 5

Trigeminal Nerve
- Opthalmic
- Maxillary
- Mandibular

Question 6

Name Cranial Nerve 6

Answer 6

Abducens Nerve

Question 7

Name Cranial Nerve 7

Answer 7

Facial Nerve

Question 8

Name Cranial Nerve 8

Answer 8

Vestibulocochlear nerve

Question 9

Name Cranial Nerve 9

Answer 9

Glossopharyngeal nerve

Question 10

Name Cranial Nerve 10

Answer 10

Vagus Nerve

Question 11

Name Cranial Nerve 11

Answer 11

Accessory Nerve

Question 12

Name Cranial Nerve 12

Answer 12

Hypoglossal Nerve

Question 13

What is the function of the Olfactory Nerve

Answer 13

The olfactory nerve provides special visceral afferent fibres for the sense of smell

Question 14

What is the function of the Optic Nerve

Answer 14

• Special somatic afferent fibres for vision
• Afferent limb of the pupillary reflex

Question 15

What is the function of the Oculomotor nerve

Answer 15

• Efferent fibres to extra-ocular muscles (inferior oblique, and superior, medial and inferior recti). CN III palsy hence causes a ‘down and out’ eye
• Efferent limb of the pupillary light reflex via pupillary constrictor muscles
• Levator palpebrae superioris

Question 16

What is the function of the Trochlear Nerve

Answer 16

• General somatic efferent to the extra-ocular muscle, superior oblique

Question 17

What is the function of the Trigeminal Nerve

Answer 17

Light touch, temperature and pain sensation
- Ophthalmic division: sensation of face above the lower eyelid
- Maxillary division: sensation of face between the lower eyelid and upper lip
- Mandibular division: sensation of face below the upper lip. Motor efferent to muscles of mastication

Question 18

What is the function of the Abducens Nerve

Answer 18

• General somatic efferent to the lateral rectus muscle, that abducts the eye

Question 19

What is the function of the Facial Nerve

Answer 19

• Special visceral efferent fibres for muscles of facial expression
• General visceral efferent fibres for the lacrimal glands, submandibular glands and sublingual glands
• Special visceral afferent fibres for taste in the anterior 2/3 of the tongue
• General somatic afferent fibres for sensation of the skin behind the ear

Question 20

What is the function of the Vestibulocochlear nerve

Answer 20

Special somatic afferent fibres for hearing and balance

Question 21

What is the function of the Glossopharyngeal nerve

Answer 21

• Sensation to the posterior 1/3 of the tongue and pharynx
• Special visceral afferent for taste from the posterior 1/3 of the tongue
• Sensation from the carotid body and carotid sinus
• Parasympathetic to Parotid glands
• Motor to stylopharyngeus

Question 22

What is the function of the Vagus Nerve

Answer 22

Parasympathetic innervation of the viscera
- Sensation the skin around the ear
- Taste and sensation of the epiglottis
- Sensory information from body viscera
- Parasympathetic to glands of GI tract
- Motor innervation to soft palate, pharynx and larynx

Question 23

What is the function of the Accessory Nerve

Answer 23

Motor efferent fibres for innervation of:
- Sternocleidomastoid
- Trapezius

Question 24

What is the function of the Hypoglossal nerve

Answer 24

General somatic efferent fibres for muscles of the tongue