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Cranial Nerves

Master all 12 cranial nerves with comprehensive guides covering origin, course, function, clinical testing, and pathology.

Remember the Cranial Nerves

"On Old Olympus Towering Tops A Finn And German Viewed Some Hops"

O=Olfactory, O=Optic, O=Oculomotor, T=Trochlear, T=Trigeminal, A=Abducens, F=Facial, A=Acoustic, G=Glossopharyngeal, V=Vagus, S=Spinal Accessory, H=Hypoglossal

Sensory Nerves

CN I, II, VIII - Pure sensory function

👃

CN ISensory

Olfactory Nerve (CN I)

Sense of smell (olfaction)

👁️

CN IISensory

Optic Nerve (CN II)

Visual perception

👂

CN VIIISensory

Vestibulocochlear Nerve (CN VIII)

Hearing (cochlear division)

Motor Nerves

CN III, IV, VI, XI, XII - Pure motor function

🎯

CN IIIMotor

Oculomotor Nerve (CN III)

Eye elevation, depression, adduction

🔄

CN IVMotor

Trochlear Nerve (CN IV)

Intorsion of the eye

↔️

CN VIMotor

Abducens Nerve (CN VI)

Eye abduction (lateral gaze)

💪

CN XIMotor

Accessory Nerve (CN XI)

Head rotation (sternocleidomastoid)

👄

CN XIIMotor

Hypoglossal Nerve (CN XII)

Tongue protrusion

Mixed Nerves

CN V, VII, IX, X - Both sensory and motor function

⚡

CN VMixed

Trigeminal Nerve (CN V)

Facial sensation (touch, pain, temperature), Sensation from oral/nasal cavities, teeth, sinuses

😊

CN VIIMixed

Facial Nerve (CN VII)

Facial expression muscles, Taste from anterior 2/3 of tongue

👅

CN IXMixed

Glossopharyngeal Nerve (CN IX)

Taste from posterior 1/3 of tongue, Sensation from posterior tongue, tonsils, pharynx, middle ear

🫀

CN XMixed

Vagus Nerve (CN X)

Parasympathetic to thoracic and abdominal viscera, Heart rate reduction

Master Cranial Nerve Examination

Use AI to practice identifying cranial nerve lesions and their clinical presentations.

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All Cranial Nerves

👃 CN I 👁️ CN II 🎯 CN III 🔄 CN IV ⚡ CN V ↔️ CN VI 😊 CN VII 👂 CN VIII 👅 CN IX 🫀 CN X 💪 CN XI 👄 CN XII