Cranial Nerves

Question 1

Cranial Nerve 1

Answer 1

Olfactory
- sensory: sense of smell
- exit through cribiform foramen
- damage causes anosmia (loss of smell)

Question 2

Cranial Nerve 2

Answer 2

Optic
- sensory: vision
- exits through optic canal/cross over at optic chiasma
- damage causes anopsias (blindness)

Question 3

Cranial Nerve 3

Answer 3

Oculomotor
- motor: moves eye up, down, and medially
moves eyelid & constricts iris
- damage cause lateral strabismus (lazy eye)
- damage causes ptosis (eyelid droop)

Question 4

Cranial Nerve IV

Answer 4

Trochlear
- Motor: moves eye down and out (diagonally)
- Damage causes diplopia (double vision)
- exits through superior orbital fissure

Question 5

Cranial Nerve V

Answer 5

Trigeminal
- Sensory: face sensation, corneal reflex
- Motor: mastication
- Damage causes trigeminal neuralgia (intense pain with jaw movement)
— Divisions: ophthalmic, maxillary, and mandibular

Question 6

Cranial Nerve VI

Answer 6

Abducens
- Motor: moves eye laterally
- Damage causes medial strabismus (lazy eye)

Question 7

Cranial Nerve VII

Answer 7

Facial
- Motor: muscles of the face, tears and salivation
- Sensory: anterior 2/3 taste on the tongue
- exits through: Internal acoustic meatus and stylomastoid foramen
- 5 divisions: Temporal, zygomatic, buccal, mandibular, cervical

Question 8

Cranial Nerve VIII

Answer 8

Vestibulocochlear
- Sensory & Motor: hearing and equilibrium
- exits through internal acoustic meatus
- damage causes deafness and vertigo

Question 9

Cranial Nerve IX

Answer 9

Glossopharyngeal
- Motor: swallowing (pharynx/esophagus) and tongue movement
- Sensory: taste (posterior 1/3 of tongue)
- on Medulla and leaves through jugular foramen
- Check through gag/swallowing reflex, position of uvula
- Damage: can’t swallow (dysphagia)