Which cranial nerve carries parasympathetic fibers that synapse in the ciliary ganglion?

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Multiple Choice

Which cranial nerve carries parasympathetic fibers that synapse in the ciliary ganglion?

Explanation:
Parasympathetic input to the ciliary ganglion comes from the oculomotor nerve. Preganglionic fibers originate in the Edinger-Westphal nucleus, travel with CN III into the orbit, and synapse in the ciliary ganglion. Postganglionic fibers then ride with short ciliary nerves to the ciliary muscle and sphincter pupillae, producing accommodation and pupil constriction. Other cranial nerves provide parasympathetics to different ganglia (for example, facial nerve to lacrimal, submandibular, and pterygopalatine ganglia; glossopharyngeal to the otic ganglion) but not to the ciliary ganglion.

Parasympathetic input to the ciliary ganglion comes from the oculomotor nerve. Preganglionic fibers originate in the Edinger-Westphal nucleus, travel with CN III into the orbit, and synapse in the ciliary ganglion. Postganglionic fibers then ride with short ciliary nerves to the ciliary muscle and sphincter pupillae, producing accommodation and pupil constriction. Other cranial nerves provide parasympathetics to different ganglia (for example, facial nerve to lacrimal, submandibular, and pterygopalatine ganglia; glossopharyngeal to the otic ganglion) but not to the ciliary ganglion.

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