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12 Cranial Nerves - Complete Study Guide

Master all 12 cranial nerves with functions, innervations, and clinical correlations. Essential for anatomy and neuroscience.

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Front

Mnemonic for Cranial Nerve Function (Sensory/Motor/Both)

Back

Some Say Marry Money But My Brother Says Big Brains Matter Most S=Sensory, M=Motor, B=Both (in order from I to XII).

Front

Cranial Nerve Brainstem Origins (Rule of 4s)

Back

Midbrain (3-4), Pons (5-8), Medulla (9-12) CN I and II originate from the forebrain/cerebrum.

Front

Which Cranial Nerves carry Parasympathetic fibers?

Back

CN III, VII, IX, and X Mnemonic: 1973 (9, 7, 3) plus the Vagus nerve.

Front

Cranial Nerves involved in Eye Movement

Back

CN III (Oculomotor), IV (Trochlear), and VI (Abducens) Mnemonic: LR6SO4R3 (Lateral Rectus 6, Superior Oblique 4, Rest 3).

Front

CN I - Olfactory (Function)

Back

Sensory (Special Visceral Afferent) Responsible for the sense of smell.

Front

CN I - Olfactory (Structures)

Back

Olfactory epithelium and bulbs Passes through the cribriform plate of the ethmoid bone.

Front

CN I - Olfactory (Clinical/Mnemonic)

Back

Anosmia Loss of smell, often caused by head trauma or COVID-19.

Front

CN II - Optic (Function)

Back

Sensory (Special Somatic Afferent) Responsible for vision.

Front

CN II - Optic (Structures)

Back

Retina and Optic Chiasm Exits the skull via the optic canal.

Front

CN II - Optic (Clinical/Mnemonic)

Back

Bitemporal Hemianopsia Tunnel vision caused by a lesion at the optic chiasm.

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