Cranial nerves

Question 1

CN(I)

Answer 1

Olfactory (I)
Sense of smell

Question 2

CN(II)

Answer 2

Optic (II)
Processes visual information

Question 3

CN(III)

Answer 3

Oculomotor (III)
The key nerve controlling eye movements

Question 4

CN(IV)

Answer 4

Trochlear (IV)
Controls a single eye muscle

Question 5

CN(V)

Answer 5

Trigeminal (V) largest CN

Motor – muscles of mastication

Sensory – facial sensation

Opthalmic branch (sensory)
Maxillary branch (sensory)
Mandibular branch (mixed)

Question 6

CN(VI)

Answer 6

Abducens (VI)
Eye movement

Question 7

CN(VII)

Answer 7

Facial nerve (VII)

Sensory: taste receptors on anterior 2/3 tongue

Motor: Muscles of facial expression

Facial nerves split into 5 branches:
Temporal, zygomatic, buccal, mandibular and cervical

Question 8

CN(VIII)

Answer 8

Vestibulocochlear (VIII)
Sensory:
Balance (vestibular branch)
Hearing (cochlear branch)

Question 9

CN(IX)

Answer 9

Glossopharyngeal (IX)

Mixed (sensory and motor) to head and neck

Sensory:
-pharynx and soft palate
-Taste sensation from posterior 1/3 of tongue

Motor-stylopharyngeus muscle involved in swallowing & innervates the parotid gland

Question 10

CN(X)

Answer 10

Vagus (X) (wandering)

Sensory: part of the pharynx, ear, diaphragm and some major organs

Motor: Muscles of palate, pharynx, digestive, respiratory and cardiovascular systems

Question 11

CN(XI)

Answer 11

Accessory (XI)

Motor to muscles of neck and upper back

Question 12

CN(XII)

Answer 12

Hypoglossal (XII)

Motor (tongue movements)

Question 13

Damage to which CN cause dysphagia

Answer 13

CN IX -Glossopharyngeal
CN X- Vagus