Cranial Nerves

Question 1

CN I

Answer 1

Olfactory

Question 2

CN I Function

Answer 2

Smell

Question 3

CN I Lesion

Answer 3

Anosmia (loss of ability to smell)

Question 4

CN II

Answer 4

Optic

Question 5

CN II Function

Answer 5

Sight/Vision

Question 6

CN II Lesion

Answer 6

Bitemporal hemianopsia (tunnel vision) - pituitary tumor

Question 7

CN III

Answer 7

Oculomotor

Question 8

CN III Function

Answer 8

Moment of eyeball
Pupillary constriction
Accommodation

Question 9

CN III Lesion

Answer 9

Aneurysm within posterior communication artery

Question 10

Lateral Stabismsus (CN III Lesion)

Answer 10

Eye rotates down and abducted due to unopposed action of lateral rectus/superior oblique
Causes double vision

Question 11

Ptosis (CN III Lesion)

Answer 11

Lid droop due to paralysis of levator palpebrae

Question 12

Mydriasis (CN III Lesion)

Answer 12

Pupil dilation

Loss of accommodation of lens

Question 13

CN IV

Answer 13

Trochlear

Question 14

CN IV Function

Answer 14

Movement of eyeball

Question 15

CN IV Lesion

Answer 15

Head tilt toward unaffected side due to eye rotation

Question 16

CN V

Answer 16

Trigeminal

3 branches - ophthalmic, maxillary, mandibular

Question 17

CN V Function

Answer 17

General sensation of face
Open/close mouth
Tension of tympanic membrane

Question 18

CN V Motor Function

Answer 18

Muscles of mastication
Mylohyoid
Anterior body of digastric

Question 19

CN V Sensory Function

Answer 19

Face
Scalp
Nose
Paranasal sinuses
Eye
Mouth
Teeth

Question 20

CN V Lesion

Answer 20

Tic doloureux (severe sudden pain in regions covered by trigeminal)

Question 21

CN VI

Answer 21

Abducens

Question 22

CN VI Function

Answer 22

Movement of eyeball

Question 23

CN VI Lesion

Answer 23

Weakness/paralysis of lateral rectus

Eye rotates inward and medially (diabetes)

Question 24

CN VII

Answer 24

Facial

Question 25

CN VII Function

Answer 25

Facial expression and taste

Question 26

CN VII Motor Function

Answer 26

Muscles of facial expression

Posterior belly of digastric

Question 27

CN VII Sensory Function

Answer 27

Tympanic membrane
External ear
Submandibular
Sublingual
Lacrimal
Nasal gland

Question 28

CN VII Lesion

Answer 28

Bell’s Palsy

Question 29

CN VIII

Answer 29

Vestibulocochlear

Question 30

CN VIII Function

Answer 30

Hearing

Balance

Question 31

CN VIII Lesion

Answer 31

Acoustic neuroma

Schwann cell tumor

Question 32

CN IX

Answer 32

Glossopharyngeal

Question 33

CN IX Function

Answer 33

Taste
Swallowing
Salivation

Question 34

CN IX Lesion

Answer 34

Test by eliciting a gag reflex

Question 35

CN X

Answer 35

Vagus

Question 36

CN X Function

Answer 36

General sensation
Visceral sensation
Control of cardiovascular/respiratory/GI system

Question 37

CN X Lesion

Answer 37

Hoarseness
Difficulty swallowing
Deviated uvula

Question 38

CN XI

Answer 38

Accessory

Question 39

CN XII

Answer 39

Hypoglossal

Question 40

CN XII Function

Answer 40

Movement of tongue

Question 41

CN XII Lesion

Answer 41

Tongue deviate to same side as lesion when tongue is protruded