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Summary of Cranial Nerves

Cranial Nerve Function Usual complaint Test of Function Physical findings
Olfactory Smell None or loss of taste if bilateral Sense of smell with each nostril tested individually No response to olfactory stimuli
Optic Vision Loss of vision Visual acuity, visual fields of each eye Decreased visual acuity or loss of visual field.
Oculomotor Eye movement, Pupillary constriction Double vision Pupil and eye movement Failure to move eye in field of motion of muscles. Pupillary abnormalities
Trochlear Eye movement Double vision especially on down and medial gaze Ability to move eye down and in May be difficult to detect anything if 3rd nerve intact
Trigeminal Facial, nasal oral sensation and jaw movement Numbness , Paresthesia Pinprick sensation on face , corneal reflex and masseter contraction Decrease d pin and absent corneal reflex. Weakness of masticatory muscle.
Abducens Eye movement Double vision on lateral gaze Moves eye laterally Failure of eye to abduct
Facial Facial movement Lack of facial movement, eye closure,Dysarthria Facial contraction,Smiling Asymmetry of Facial contraction
Auditory and vestibular Hearing balance Hearing loss, Tinnitus, Vertigo Hearing test, Nystagmus balance Decreased hearing, Nystagmus, Ataxia
Glossopharyngeal Palatal Movement Trouble with Swallowing Elevation of Palate Asymmetric Plate
Vagus Palatal movement, Vocal cords Trouble swallowing Vocal cords Brassy voice
Spinal Accessory Turns neck None Contraction of sternocleidomastoid and trapezius Paralysis of sternocleidomastoid muscle
Hypoglossal Moves tongue Dysarthria Protrusion of tongue Wasting and fasciculation or deviation of tongue


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