Testing Cranial Nerves Functionality

NERVE FUNCTION HOW TO TEST

I

Olfactory

olfaction

with an odorous substance

II

Optic

vision

vision chart

III

Oculomotor

most eye muscles

“follow the moving finger”

IV

Trochlear

superior oblique

look down at the nose

V

Trigeminal

facial sensation

touch the face

muscles of mastication

clench the teeth

VI

Abducens

lateral rectus

look to the side

VII

Facial

facial expression

smile, raise the eyebrows

taste

sugar or salt

VIII

Vestibulo-

cohlear

hearing

a tuning fork

balance

look for vertigo

IX

Glosso-

pharyngeal

pharynx sensation

gag reflex

X

Vagus

muscles of larynx and pharynx, parasymp.

check for hoarseness, open wide and say “AH”

XI

Accessory

trapezius and sternocleidomastoid

test shoulder raise or turning the head

XII

Hypoglossal

tongue muscles

stick out the tongue


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