Cranial Nerves

Question 1

What are cranial nerves designated by?

Answer 1

-roman numerals which indicate the order from cranial to caudal
-names which indicate the distribution, structure or function

Question 2

Sensory Nerves

Answer 2

contain axons of sensory neurons: I, II, VIII

Question 3

Motor Nerves

Answer 3

contains axons of motor neurons: III, IV, VI, XI, XII

Question 4

Mixed Nerves

Answer 4

contains axons of sensory & motor neurons: V, VII, IX, X

Question 5

1st Cranial Nerve

Answer 5

I) Olfactory (s)
function: olfaction (smell)
exits through: cribriform plate

Question 6

2nd Cranial Nerve

Answer 6

II) Optic Nerve (s)
function: vision
exits through: optic canal

Question 7

3rd Cranial Nerve

Answer 7

III) Oculomotor Nerve (M)
function: movement of the eyeballs
exits through: superior orbital fissure

Question 8

4th Cranial Nerve

Answer 8

IV) Trochlear Nerve (M)
function: movement of the eyeballs
exits through: superior orbital fissure

Question 9

5th Cranial Nerve

Answer 9

V) Trigeminal Nerve (B)
**3 divisions
function: sensory innervation to the face, motor innervation to muscles of mastification
exits through:
1) Ophthalmic branch (V1): superior orbital fissure
2) Maxillary branch (V2): Foramen rotundum
3) Mandibular branch (V3): Foramen ovale

Question 10

6th Cranial Nerve

Answer 10

VI) Abducens Nerve (M)
function: movement of the eyeballs
exits through: superior orbital fissure

Question 11

7th Cranial Nerve

Answer 11

VII) Facial Nerve (B)
Function: control muscles of facial expression, taste for anterior 2/3 of tongue
exits through: stylomastoid foramen

Question 12

8th Cranial Nerve

Answer 12

VIII) Vestibulocochlear Nerve (S)
function: hearing and equilibrium
exits through: internal acoustic meatus

Question 13

9th cranial nerve

Answer 13

IX) Glossopharangeal Nerve (B)
function: taste for posterior 1/3 of tongue
exits through: Jugular foramen

Question 14

10th Cranial Nerve

Answer 14

X) Vagus Nerve (B)
function: autonomic regulation (HR, digestion, breathing…)
exits through: Jugular foramen

Question 15

11th Cranial Nerve

Answer 15

XI) Accessory Nerve (M)
function: innervation of trapezius and sternocleidomastoid muscles
exits through: formamen magnum

Question 16

12th Cranial Nerve

Answer 16

XII) Hypoglossal Nerve (M)
function: speech, manipulation of food, swallowing
exits through the hypoglossal foramen