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Anatomy & Neuroanatomy

Neuroanatomy

Cranial Nerves

Cranial nerves chart covering CN I through XII, motor vs sensory classification, and anesthesia-relevant airway, eye, and neurologic correlations.

24 items~12 minutesflashcard

Reference

Review the core table first, then launch practice to convert recognition into faster recall.

Cranial nerves overview

Number	Name	Type	Key functions	Anesthesia relevance
I	Olfactory	Sensory	Smell	Loss can signal skull-base injury before nasal instrumentation.
II	Optic	Sensory	Vision, afferent limb of pupillary light reflex	Visual changes matter in prone cases and perioperative vision complaints.
III	Oculomotor	Motor	Most extraocular movements, eyelid elevation, pupillary constriction	Pupillary asymmetry or eye-position changes can signal neurologic injury.
IV	Trochlear	Motor	Superior oblique muscle	Vertical diplopia helps localize orbital or brainstem dysfunction.
V	Trigeminal	Both	Facial sensation, mastication, corneal reflex afferent	Important for mask tolerance, corneal reflex, and awake airway topicalization.
VI	Abducens	Motor	Lateral rectus muscle	Lateral gaze palsy can reflect increased intracranial pressure.
VII	Facial	Both	Facial expression, taste anterior 2/3 of tongue, corneal reflex efferent	Facial nerve injury matters for eye protection and postop facial weakness assessment.
VIII	Vestibulocochlear	Sensory	Hearing and balance	Relevant to otologic surgery, postoperative vertigo, and hearing complaints.
IX	Glossopharyngeal	Both	Taste posterior 1/3 tongue, gag afferent, carotid body/sinus input	Glossopharyngeal nerve blocks help blunt awake intubation reflexes.
X	Vagus	Both	Laryngeal function, parasympathetic output to thoracoabdominal viscera	RLN and SLN injury affects phonation, cough, airway protection, and extubation assessment.
XI	Accessory	Motor	Sternocleidomastoid and trapezius	Shoulder weakness can follow neck dissection or positioning injury.
XII	Hypoglossal	Motor	Tongue movement	Tongue weakness affects airway patency, speech, and swallowing after airway manipulation.

Citations

Moore, Clinically Oriented Anatomy — cranial nerve anatomy and functions.
Miller's Anesthesia, 9th Ed — airway reflexes, laryngeal innervation, and perioperative neurologic assessment.

This tool is for educational purposes only. Always verify clinical values against current authoritative sources before patient care.