Week 9 - The Cranial Nerves

Question 1

What is the function of cranial nerve I?

Answer 1

Olfaction

Cranial nerve I is responsible for the sense of smell.

Question 2

What type of nerve is cranial nerve II?

Optic Nerve

Answer 2

Special somatic afferent

Cranial nerve II is primarily involved in vision.

Question 3

Where do the fibers of cranial nerve II exit the skull?

Answer 3

Optic canal

Question 4

What is the primary function of cranial nerve III?

Oculomotor Nerve

Answer 4

Motor to:
- Superior rectus
- Medial rectus,
- Inferior rectus,
- Inferior oblique,
- Levator palpebrae superioris

Question 5

What type of fibers does Cranial Nerve III contain for parasympathetic functions?

Oculomotor Nerve

Answer 5

General visceral efferent

Question 6

Cranial nerve IV is responsible for motor function to which muscle?

Trochlear Nerve

Answer 6

Superior oblique

Question 7

Cranial nerve V has three divisions. What are they?

Answer 7

• Ophthalmic (V1)
• Maxillary (V2)
• Mandibular (V3)

Question 8

What is the exit point of cranial nerve V1?

Trigeminal Nerve (Opthalmic branch)

Answer 8

Superior orbital fissure

Question 9

Cranial Nerve V3 provides sensation to which areas?

Trigeminal Nerve (Mandibular branch)

Answer 9

• Lower face
• Scalp
• Tongue and floor of mouth
• Mandibular teeth and part of external ear

Question 10

What is the primary function of cranial nerve VI?

Abducens Nerve

Answer 10

Motor to lateral rectus

Question 11

What type of fibers does cranial nerve VII have that are involved in taste?

Facial Nerve

Answer 11

Special visceral afferent

Question 12

What is the function of the parasympathetic fibres of cranial nerve VII?

Facial Nerve

Answer 12

Parasympathetic fibres to:
- Lacrimal gland
- Salivary glands

Question 13

What is the exit point of Cranial Nerve VIII?

Vestibulocochlear Nerve

Answer 13

Internal acoustic meatus

Question 14

What are the two divisions of cranial nerve VIII?

Vestibulocochlear Nerve

Answer 14

• Vestibular division
• Cochlear division

Question 15

What type of sensation does the vestibular division of cranial nerve VIII provide?

Vestibulocochlear Nerve

Answer 15

Sensations of equilibrium and motion

Question 16

What is the primary function of cranial nerve IX?

Glossopharyngeal Nerve

Answer 16

Motor to stylopharyngeus

Question 17

Cranial nerve IX provides taste sensation from which part of the tongue?

Glossopharyngeal Nerve

Answer 17

Posterior one-third

Question 18

Which cranial nerve is responsible for parasympathetic innervation to the parotid salivary gland?

Answer 18

Cranial nerve IX

Glossopharyngeal Nerve

Question 19

What is the primary function of cranial nerve X?

Vagus Nerve

Answer 19

Motor to:
- Pharyngeal muscles
- External laryngeal muscles
- Oesophageal striated muscles

Question 20

What type of fibres does cranial nerve X carry for general visceral functions?

Vagus Nerve

Answer 20

General visceral efferent

Question 21

What are the two roots of cranial nerve XI?

Accessory Nerve

Answer 21

• Cranial Root
• Spinal Root

Question 22

What is the exit point of cranial nerve XI?

Accessory Nerve

Answer 22

Jugular foramen

Question 23

What is the primary function of cranial nerve XII?

Hypoglossal Nerve

Answer 23

Motor to all intrinsic and extrinsic muscles of the tongue

Extrinsic
- Styloglossus
- Hyoglossus
- Genioglossus

Intrinsic
- Superior longitudinal
- Inferior longitudinal
- Vertical
- Transerve
- (Oblique)

Except Palatoglossus which is innervated by Vagus N.