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Cranial Nerves

Cranial nerves

QuestionAnswer
I OLFACTORY; have pt smell alcohol swab
II OPTIC; visual acuity and visual fields; have pt identify # fingers; check peripheral vision ("tell me when you see my fingers"); snellen test
III OCULOMOTOR: pupillary reaction to light, elevation of upper eyelid, and most EOMs (up, up and out, inward towards nose). Abnormalities include anisocoria, ptosis and nystagmus
IV TROCHLEAR: downward, internal rotation of eye during EOMs
V TRIGEMINAL (3 braches): motor = muscles of mastication (bite down, move jaw side-to-side); sensory = feeling opthalmic, maxillary and mandibular region of face; also controls sensory portion of corneal reflex (facial controls motor)
VI ABDUCENS: lateral eye movement during EOMs
VII FACIAL: motor = raise eyebrows, smile, puff cheeks, close eyes tightly - closes eyelid(muscles of expression); sensory = taste on anterior 2/3 of tongue
VIII ACOUSTIC or VESTIBULOCOCHLEAR: hearing and balance. Rhomberg test (stand with eyes closed); cold calorics, doll's eyes
IX GLOSSOPHARYNGEAL: swallowing, voice, gag reflex; taste on posterior 1/3 of tongue
X VAGUS: gag reflex
XI SPINAL ACCESSORY: controls neck (sternomastoid) and shoulder (upper trapezius); turn head side to side against hand, shrug shoulders
XII HYPOGLOSSAL: controls tongue movements; stick out tongue, move side to side
Created by: rwilson