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Cranial Nerves medic

Paramedic Level

Olfactory Nerve Cranial Nerve I Type: Sensory Function: Sense of Smell Test: Ask Pt. to close their eyes, then hold an alcohol swab up to nose and inquire about ability to smell.
Oculomotor Nerve Cranial Nerve III Type: Motor Function: Eye movement, Pupil constriction Test: Have Pt. follow finger in H pattern. Test pupil response w/ penlight. Diagnosis: Pinpoint pupils = opiate OD or trauma to pons; Dilated pupils = anxiey, seizure, or stimulant use; Sluggish or fixed pupils = brain injury or swelling.
Trochlear Nerve Cranial Nerve IV Type: Motor Function: Downward gaze Test: Have Pt. hold head still while following your finger in H pattern, then inwards to touch nose.
Trigeminal Nerve Test: Have Pt. hold head still while following your finger in H pattern, then inwards to touch nose. Test: Ask Pt. to open wide, then clench jaw while palpating lower jaw muscles. Touch each side of forehead, sheek and lower jaw to determine sensory ability.
Abducens Nerve Cranial Nerve VI Type: Motor Function: Lateral Eye Movement Test: Have Pt. hold head still while following your finger in H pattern, then inward to touch nose.
Facial Nerve Cranial Nerve VII Type: Sensory and Motor Function: (S) Taste (M) Sectretion of saliva, facial expressions Test: Assess facial movement during interrogation, ask Pt. to smile, raise eyebrows, blow up cheeks. Any assymmetrical movement is bad, usually indicative of a stroke at the middle cerebral artery. Click to flip
Acoustic (Vestibulocochlear) Cranial Nerve VIII Type: Sensory Function: Senses of hearing and balance Test: Stand behind Pt. then rub fingers together near each ear and inquire as to which side the sound is coming from.
Glossopharyngeal Nerve Cranial Nerve IX Type: Sensory and Motor Function: (S) Taste sensation from posterior tongue and pharynx (M) Muscles of swallowing and gag reflex Test: Ask Pt. to open mouth wide and say "Ah" while inspecting uvula. Pull to one side indicates possible stroke affecting CN9 on side opposite to uvula pull.
Vagus Nerve Cranial Nerve X Type: Sensory and Motor Function: (S) Gag reflex and stretch receptors in gut (M) Decreases heart rate, increases peristalsis, contracts muscles for voice production. Test: Test gag reflex by tickling back of throat, however not usually necessary and prone to create vomitus!
Spinal Accessory Nerve Cranial Nerve XI Type: Motor Function: Shoulder movements, turning of head, and movements of viscera. Test: Evaluate muscle strength against resistance in the trapezius and sternocleidomastoids via shrugging and looking left and right respectively.
Hypoglossal Cranial Nerve XII Type: Motor Function: Tongue Movements Test: Ask Pt. to protrude tongue then move it in all four cardinal directions. Note favoring of one side or absence of smooth, fluid motions.
Optic Nerve Cranial Nerve II Type: Sensory Function: Sense of Sight Test: Ask Pt. to cover one eye, then hold up a number of fingers and ask Pt. to announce number or fingers seen. Repeat for opposite eye.
Created by: cjchaillou



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