Cranial Nerves

Question 1

olfactory

Answer 1

• sensory nerve

- each nerve is composed of 20 small rootlets which pass into the roof of the nasal cavity

Question 2

optic

Answer 2

• sensory nerve
• used for vision
• moves eyeball (kinda)
• passes thalamus and part of the midbrain

Question 3

oculomotor

Answer 3

• motor nerve
• moves eyeball
• contains autonomic nerve fibers (controls shape of pupil and lens)

Question 4

trochlear

Answer 4

• motor nerve

- controls one muscle that moves the eyeball

Question 5

trigeminal

Answer 5

• motor and sensory**
• sensory for most of head region including skin and face, teeth
• muscles for muscles of mastication

Question 6

abducens

Answer 6

-motor nerve: controls one extrinsic muscle of the eyeball**

Question 7

facial

Answer 7

• motor and sensory nerve(for earlobe)
• controls muscles of facial expression**
• contains autonomic fibers which control secretion of salivary glands and lacrimal gland
• carries taste from the anterior 2/3’s of tongue

Question 8

vestibulocochlear

Answer 8

• sensory nerve
• vestibular involved in sense of balance
• cochlear is involved in sense of hearing

Question 9

glossopharyngeal

Answer 9

• motor and sensory(posterior wall of pharynx)
• carries taste sensation**
• controls one muscle of pharynx**

Question 10

vagus

Answer 10

• motor and sensory(larynx and ear)
• control laryngeal muscles
• carries autonomic fibers to smooth muscle in thorax, abdomen, and to heart

Question 11

accessory

Answer 11

• motor nerve

- controls trapezius and SCM muscles

Question 12

hypoglossal

Answer 12

• motor nerve

- controls muscles of tongue