Cranial Nerve
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Cranial Nerve
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Neuromuscular: Cranial Nerve Afferents, Efferents, Testing
Cranial Nerve | Afferent (Sensory) | Efferent (Motor) | Test |
---|---|---|---|
olfactory (CN I) | smell | identify familiar odors | |
optic (CN II) | sight | test visual fields and visual acuity | |
oculomotor (CN III) | voluntary: levator of eyelid; superior, medial and inferior recti, inferior oblique muscle of eyeball. autonomic: smooth muscle of eyeball | upward, downward, and medial gaze reaction to light | |
trochlear (CN IV) | voluntary: superior oblique muscle of eyeball | downward and inward gaze | |
trigeminal (CN V) | touch and pain of skin of face, mucous membrane of nose, sinuses, mouth, anterior tongue | voluntary: muscles of mastication | corneal reflex face sensation clench teeth and push down on chin to separate jaw |
abducens (CN VI) | voluntary: lateral rectus muscle of eyeball | lateral gaze | |
facial (CN VII) | taste on anterior tongue | voluntary: facial muscles autonomic: lacrimal, submandibular, and sublingual glands | close eyes tight smile and show teeth whistle and puff cheeks identify familiar tastes |
vestibulocochlear (CN VIII) | hearing and balance | hearing tests balance and coordination tests | |
glossopharyngeal (CN IX) | touch and pain in posterior tongue, pharynx taste on posterior tongue | voluntary: pharynx muscle autonomic: parotid gland | gag reflex ability to swallow |
vagus (CN X) | touch and pain in pharynx, larynx, and bronchii taste on tongue and epiglottis | voluntary:muscles of palate, pharynx and larynx autonomic: thoracic and abdominal viscera | gag reflex ability to swallow say "ahh" |
accessory (CN XI) | voluntary: sternocleidomastoid and trapezius | resisted shoulder shrug | |
hypoglossal (CN XII) | voluntary: muscles of tongue | tongue protrusion |