Cranial Nerves

Question 0

CN II

Answer 0

Optic-Sees

Question 1

CN I

Answer 1

Olfactory-Smells

Question 2

CN III

Answer 2

Oculomotor-Constricts pupils, accommodates

Question 3

CN IV

Answer 3

Trochlear-Innervates superior oblique. Injury to the trochlear nerve cause weakness of downward eye movement with consequent vertical diplopia (double vision). The affected eye drifts upward relative to the normal eye, due to the unopposed actions of the remaining extraocular muscles. The patient sees two visual fields (one from each eye), separated vertically. To compensate for this, patients learn to tilt the head forward (tuck the chin in) in order to bring the fields back together.

Question 4

CN V

Answer 4

Trigeminal-Chewing, feels front of head

Question 5

CN VI

Answer 5

Abducens-Controls lateral rectus, Complete interruption of the peripheral sixth nerve causes lateral double vision. The affected eye is pulled medially. In order to see without double vision patients will rotate their heads so that both eyes are toward the temple. Partial damage to the sixth nerve causes weak or incomplete abduction of the affected eye. The diplopia is worse on attempted lateral gaze, as would be expected.

Question 6

CN VII

Answer 6

Facial-Expression, taste, salivate, cries

Question 7

CN VIII

Answer 7

Vestibulocochlear-Hearing and balance

Question 8

CN IX

Answer 8

Glossopharyngeal-Tastes, salivates, swallows, monitors carotid body and sinus

Question 9

CN X

Answer 9

Vagus-Tastes, swallows, lifts palate, talking, communication to and from thoraco abdominal viscera

Question 10

CN XI

Answer 10

Spinal Accessory-Turns head, lifts shoulders

Question 11

CN XII

Answer 11

Hypoglossal-Moves tongue/Tongue thrust