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Anatomy & Embryology | Physician Assistant (PA) School Study Aid
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
1 min
CN I
- Olfactory Nerve
- Sensory
- Smell
36 secs
CN II
- Optic Nerve
- Sensory
- Vision
35 secs
CN III
- Oculomotor Nerve
- Motor
- Eye Movement
- Accommodation
- Eyelid Opening
- Pupillary Constriction
1 min
CN IV
- Trochlear Nerve
- Motor
- Abducts, Depresses, Internally Rotates
48 secs
CN V
- Trigeminal Nerve
- Sensory
- Facial Sensation
- Motor Function (Via Mandibular Nerve)
- Mastication Muscles
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
56 secs
CN VI
- Abducens Nerve
- Motor
- Abducts Eye
48 secs
CN VII
- Facial Nerve
- Lacrimation
- Salivation
- Sensory
- Taste from Anterior 2/3 of Tongue
- Motor
- Facial Movement
- Stapedius Muscle
- Eyelid Closing
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
2 mins
CN VIII
- Vestibulocochlear Nerve
- Sensory
- Hearing
- Balance
55 secs
CN IX
- Glossopharyngeal Nerve
- Sensory
- Taste from Posterior 1/3 of Tongue
- Monitoring Carotid Body and Sinus
- Motor
- Stylopharyngeus
- Swallowing
- Salivation
1 min
CN X
- Vagus Nerve
- Sensory
- Aortic Arch Chemoreceptors and Baroreceptors
- Taste from Epiglottic Region
- Motor
- Swallowing
- Palate Elevation
- Talking
- Coughing
- Midline Uvula
1 min
CN X Lesion
- Uvula Deviation To Contralateral Side
- Impaired Gag Reflex
- Difficulty Swallowing
- Hoarse Voice
- Impaired Coughing
- Aspiration Pneumonia
2 mins
CN XI
- Accessory Nerve
- Motor
- Head Turning
- Shoulder Shrugging
36 secs
CN XI Lesion
- Cause/Mechanism
- Iatrogenic
- Clinical Manifestations
- Sternocleidomastoid Muscle Paralysis
- Trapezius Muscle Paralysis
1 min
CN XII
- Hypoglossal Nerve
- Motor
- Tongue Movement
34 secs
Cranial Nerves I and II Assessments
- Cranial Nerve I - Olfactory Nerve
- Use Familiar Attainable Smells
- Note Any Sense of Smell Asymmetry
- Cranial Nerve II - Optic Nerve
- Test Visual Fields
2 mins
Cranial Nerves III, IV and VI Assessments
- Cranial Nerve III - Oculomotor Nerve
- Cranial Nerve IV - Trochlear Nerve
- Cranial Nerve VI - Abducens Nerve
- Assess Extraocular Movements, P.E.R.R.L.A
- Note Any Nystagmus
2 mins
Cranial Nerves V and VII Assessments
- Cranial Nerve V - Trigeminal Nerve
- Assess Temporal and Masseter Muscles
- Assess Light Touch Sensation
- Cranial Nerve VII - Facial Nerve
- Note Mobility and Facial Symmetry
2 mins
Cranial Nerves VIII, IX and X Assessments
- Cranial Nerve VIII - Acoustic (Vestibulocochlear) Nerve
- Test Hearing to Normal Conversation
- Whisper Test
- Cranial Nerve IX - Glossopharyngeal Nerve
- Cranial Nerve X - Vegus Nerve
- Depress the Tongue and Say “Ahh”
- Touch the Posterior Pharyngeal
2 mins
Cranial Nerves XI and XII Assessments
- Cranial Nerves XI - Spinal Accessory Nerve
- Examine Sternocleidomastoid Muscles
- Examine Trapezius Muscles
- Cranial Nerve XII - Hypoglossal Nerve
- Inspect the Tongue
- Note Lingual Speech
2 mins
CN XII Lesion (Hypoglossal Nerve)
- Medulla
- Tongue Deviated Toward Lesion
- Paralysis
- Fasciculations
- Atrophy
1 min
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