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Medicine (MD/DO)
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USMLE Step 1
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Anatomy & Embryology
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Cranial Nerves

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Anatomy & Embryology | Medicine (MD/DO) School Study Aid

Cranial Nerves
18 Picmonics to Learn | 20 mins
Cranial Nerve Function
Sensory
CN I
CN II
CN VIII
Motor
CN III
CN IV
CN VI
CN XI
CN XII
Both
CN V
CN VII
CN IX
CN X
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1 min
CN I
Olfactory Nerve
Sensory
Smell
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36 secs
CN II
Optic Nerve
Sensory
Vision
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35 secs
CN III
Oculomotor Nerve
Motor
Eye Movement
Accommodation
Eyelid Opening
Pupillary Constriction
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1 min
CN IV
Trochlear Nerve
Motor
Abducts, Depresses, Internally Rotates
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48 secs
CN V
Trigeminal Nerve
Sensory
Facial Sensation
Motor Function (Via Mandibular Nerve)
Mastication Muscles
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1 min
CN V Motor Lesion
CN V motor lesion
Jaw Deviates Toward Side of Lesion
Unopposed Force From The Opposite Pterygoid Muscle
Muscles of Mastication
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56 secs
CN VI
Abducens Nerve
Motor
Abducts Eye
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48 secs
CN VII
Facial Nerve
Lacrimation
Salivation
Sensory
Taste from Anterior 2/3 of Tongue
Motor
Facial Movement
Stapedius Muscle
Eyelid Closing
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1 min
Facial Nerve Lesions
Etiology
Diabetes Mellitus
Sarcoidosis
Tumors
Herpes Simplex Virus (HSV)
Bell's palsy
Varicella Zoster Virus (VZV)
Lyme Disease
Treatment
Corticosteroids
Acyclovir
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2 mins
CN VIII
Vestibulocochlear Nerve
Sensory
Hearing
Balance
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55 secs
CN IX
Glossopharyngeal Nerve
Sensory
Taste from Posterior 1/3 of Tongue
Monitoring Carotid Body and Sinus
Motor
Stylopharyngeus
Swallowing
Salivation
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1 min
CN X
Vagus Nerve
Sensory
Aortic Arch Chemoreceptors and Baroreceptors
Taste from Epiglottic Region
Motor
Swallowing
Palate Elevation
Talking
Coughing
Midline Uvula
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1 min
CN X Lesion
Uvula Deviation To Contralateral Side
Impaired Gag Reflex
Difficulty Swallowing
Hoarse Voice
Impaired Coughing
Aspiration Pneumonia
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2 mins
CN XI
Accessory Nerve
Motor
Head Turning
Shoulder Shrugging
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36 secs
CN XI Lesion
Cause/Mechanism
Iatrogenic
Clinical Manifestations
Sternocleidomastoid Muscle Paralysis
Trapezius Muscle Paralysis
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1 min
CN XII
Hypoglossal Nerve
Motor
Tongue Movement
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34 secs
CN XII Lesion (Hypoglossal Nerve)
Medulla
Tongue Deviated Toward Lesion
Paralysis
Fasciculations
Atrophy
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1 min

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