Cranial Nerves

Question 1

What is the I cranial nerve?

Answer 1

Olfactory (I)

Question 2

What is the II cranial nerve?

Answer 2

Optic (II)

Question 3

What is the III cranial nerve?

Answer 3

Oculomotor (III)

Question 4

What is the IV cranial nerve?

Answer 4

Trochlear (IV)

Question 5

What is the V cranial nerve?

Answer 5

Trigeminal (V)

Question 6

What is the VI cranial nerve?

Answer 6

Abducens (VI)

Question 7

What is the VII cranial nerve?

Answer 7

Facial (VII)

Question 8

What is the IX cranial nerve?

Answer 8

Glossopharyngeal (IX)

Question 9

What is the X cranial nerve?

Answer 9

Vagus (X)

Question 10

What is the XI cranial nerve?

Answer 10

Accessory (XI)

Question 11

What is the XII cranial nerve?

Answer 11

Hypoglossal (XII)

Question 12

What is the mneumonic for remembering the function of the cranial nerves?

Answer 12

Some 
Say
Marry
Money
But 
My 
Brother
Says
Big
Boobs/Brains
Matter
More

Question 13

What is the function of the I (1) cranial nerve?

Answer 13

Sensory (Some) - Olfactory

Smell

Question 14

What is the function of the II (2) cranial nerve?

Answer 14

Sensory (Say) - Optic

Sight

Question 15

What is the function of the III (3) cranial nerve?

Answer 15

Motor (Marry) - Oculomotor

Eye movement (MR, IO, SR, IR)
Pupil constriction
Accommodation
Eyelid opening

Question 16

What is the clinical presentation of a lesion to the III (3) cranial nerve?

Answer 16

Facial nerve palsy

Prostitute Eye - (3)
Ptosis (Hooded Lid)
‘Down and Out’ Eye
Dilated, fixed pupil

Question 17

What is the function of the IV (4) cranial nerve?

Answer 17

Motor (Money) - Trochlear

Eye movement (SO)

Question 18

What is the clinical presentation of a lesion to the IV (4) cranial nerve?

Answer 18

Defective downwards gaze –> Vertical diplopia

Question 19

What is the function of the V (5) cranial nerve?

Answer 19

Both (But) - Trigeminal

Facial sensation
Mastication

Question 20

What is the clinical presentation of a lesion to the V (5) cranial nerve?

Answer 20

Trigeminal - Legion may cause: 
TRIGEMINAL neuralgia
Loss of corneal reflex (afferent)
Loss of facial sensation
Paralysis of mastication muscles
Deviation of jaw to weak side

Question 21

What is the function of the VI (6) cranial nerve?

Answer 21

Motor (My) - Abducens

Eye movement (LR)

Question 22

What is the clinical presentation of a lesion to the VI (6) cranial nerve?

Answer 22

Defective abduction –> Horizontal diplopia

Question 23

What is the function of the VII (7) cranial nerve?

Answer 23

Both (Brother) - Facial

Facial movement
Taste (Anterior 2/3 of tongue)
Lacrimation
Salivation

Question 24

What is the clinical presentation of a lesion to the VII (7) cranial nerve?

Answer 24

Lesions may result in:
Flaccid paralysis of the upper + lower face (LMN - no forehead sparing)
Loss of corneal reflex (efferent)
Loss of taste 
Hyperacusis (painful sounds)

Question 25

What is the function of the VIII (8) cranial nerve?

Answer 25

Sensory (Says) - Vestibulocochlear Hearing Balance

Question 26

What is the clinical presentation of a lesion to the VIII (8) cranial nerve?

Answer 26

Hearing loss Vertigo Nystagmus (Can be caused by acoustic neuromas)

Question 27

What is the function of the IX (9) cranial nerve?

Answer 27

Both (Big) - Glossopharyngeal Taste (Posterior 1/3 of tongue) Salivation Swallowing Mediates input from carotid body and sinus

Question 28

What is the clinical presentation of a lesion to the IX (9) cranial nerve?

Answer 28

Hypersensitive carotid sinus reflex | Loss of gag reflex (afferent)

Question 29

What is the function of the X (10) cranial nerve?

Answer 29

Both (Brains/Boobs) - Vagus Phonation Swallowing Innervates viscera

Question 30

What is the clinical presentation of a lesion to the X (10) cranial nerve?

Answer 30

Ulva deviates away from the site of lesion | Loss of gag reflex (efferent0

Question 31

What is the function of the XI (11) cranial nerve?

Answer 31

Motor (Matter) - Accessory Head and shoulder movement

Question 32

What is the clinical presentation of a lesion to the XI (11) cranial nerve?

Answer 32

Weakness in turning head to contralateral side

Question 33

What is the function of the XII (12) cranial nerve?

Answer 33

Motor (More) - Hypoglossal Tongue movement

Question 34

What is the clinical presentation of a lesion to the XII (12) cranial nerve?

Answer 34

Tongue deviates towards side of lesion.