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The 12 Cranial Nerves
Everything you did and didn't want to know...
25
Medical
Not Applicable
11/30/2005
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Term
Name, (S, M, B): CN I
 Definition
Olfactory, S
Term
Name, (S, M, B): CN II
 Definition
Optic, S
Term
Name, (S, M, B): CN III
 Definition
Oculomotor, M
Term
Name, (S, M, B): CN IV
 Definition
Trochlear, M
Term
Name, (S, M, B): CN V
 Definition
Trigeminal, B
Term
Name, (S, M, B): CN VI
 Definition
Abducens, M
Term
Name, (S, M, B): CN VII
 Definition
Facial, B
Term
Name, (S, M, B): CN VIII
 Definition
Acoustic, S
Term
Name, (S, M, B): CN IX
 Definition
Glossopharyngeal, B
Term
Name, (S, M, B): CN X
 Definition
Vagus, B
Term
Name, (S, M, B): CN XI
 Definition
Spinal Accessory, M
Term
Name, (S, M, B): CN XII
 Definition
Hypoglossal, M
Term
How do you test: CN I
 Definition
Identify familiar smells, one nostril at a time.
Term
How do you test: CN II
 Definition
Test visual acuity, examine optic nerve and retina with ophthalmoscope
Term
How do you test: CN III
 Definition
Test pupillary light reflex, check extraocular eye movements (except medial down and lateral across)
Term
How do you test: CN IV
 Definition
Evaluate extraocular eye movement (superior oblique muscle, movement is medial and downward)
Term
How do you test: CN V
 Definition
Test motor function by clenching jaw muscles and palpating masseter and temporal muscle for firmness, test sensory with corneal reflex and using sharp, dull, and soft touching on the face
Term
How do you test: CN VI
 Definition
Evaluate extraocular eye movement (lateral rectus muscle, movement is lateral)
Term
How do you test: CN VII
 Definition
Test motor function by making faces (smiling, blowing, wrinkling forehead) and closing eyes, test sensory function by testing sweet and salty tastes on the anterior tongue
Term
How do you test: CN VIII
 Definition
Evaluate hearing acuity, perform Romberg test
Term
How do you test: CN IX / X
 Definition
Elicit gag reflex bilaterally, movement of palate during swallowing and "ahh," as well as speech quality (CN X)
Term
How do you test: CN XI
 Definition
Shrug shoulders with resistance, turn head with resistance
Term
How do you test: CN XII
 Definition
Stick out tongue, move around, check symmetry
Term
Name all the cranial nerves that ennervate the tongue and what their function is.
 Definition
Anterior 2/3 for taste: Facial (CN VII)

Anterior 2/3 for touch: Trigeminal (CN V3)

Posterior 1/3 for taste and touch: Glossopharyngeal (CN IX)

Motor function: Hypoglossal (CN XII)
Term
Which cranial nerves are found in the carotid triangle?
 Definition
CN IX, X, XI, XII
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