Cranial Nerves

Question 1

Only nerve to be affected by MS

Loss of light reflex when combined with CN 3

Answer 1

CN 2 - OPTIC

Question 2

Innervates most eye muscles
ADDUCTION - most important by medial rectus
Constricts pupil
lesion can result in diplopia or loss of parallel gaze
EXTERNAL STRABISMUS – note: CN 6 was INTERNAL STRABISMUS!!

PTOSIS - CN 6 is pseduoptosis

Answer 2

CN 3 - OCULOMOTOR

Question 3

Innervates superior oblique
—Depresses and ABDUCTS

hea will tilt AWAY from lesion

Answer 3

CN 4 - TROCHLEAR

Question 4

General sensation to most of face
Motor to MOM and MATT
**Ant belly of digastric.. but not post belly

Answer 4

CN 5 - TRIGEMINAL
V1 - opth
V2 - Max
V3 - Mand

Question 5

Motor to Lateral Recturs
ABDUCTION
Lesion = loss of parallel gaze - diplopia
INTERNAL STRABISMUS – note: CN 3 was EXTERNAL STRABISMUS!!

PSEUDOPTOSIS – CN 3 was real ptosis

Answer 5

CN 6 - ABDUCENS

Question 6

MOFE
POST BELLY DIGASTRIC!!
Salivation - submand and subling glands
ANTERIOR 2/3 TASTE

Lesipon = can’t wrinkle forehead, corner of mouth droops, can’t close eyes, loss of blink reflex

Answer 6

CN 7 - FACIAL

Question 7

Hearing and linear and ngular acceleration

Answer 7

CN 8 - Vestibulocochlear

Question 8

Salivation - PAROTID
Taste to POST 1/3
Sensory to pharynx and carotid sinus
MOTOR to STYLOPHARYNGEUS

if CN 10 is lost too –> loss of gag reflex

Answer 8

CN 9 - GLOSSOPHARYNGEAL

Question 9

Swallowing
Laryn - voice 
Sensory to GI 
Lesion = loss of cough reflex
lesion with CN 9 = loss of gag refle

Answer 9

CN 10 - VAGUS

Question 10

SCM and traps
head rotation via SCM
Lesion = shulder drop

Answer 10

CN 11 - ACCESORY

Question 11

TONGUE MOVEMENT and intrinsic tongue muscles

tongue will point to SAME DIRECTION as side of lesion upon protrusion

Answer 11

CN 12 - HYPOGLOSSAL