Which nerve carries efferent parasympathetic fibers to the sphincter pupillae?

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Multiple Choice

Which nerve carries efferent parasympathetic fibers to the sphincter pupillae?

Explanation:
Parasympathetic control of the pupil comes from the oculomotor nerve. Preaganglionic parasympathetic fibers originate in the Edinger–Westphal nucleus and travel with CN III to the ciliary ganglion. There they synapse, and the postganglionic fibers ride with the short ciliary nerves to the sphincter pupillae, causing pupil constriction (miosis). The other nerves don’t carry parasympathetic efferents to the sphincter pupillae: they either provide motor or sensory functions for the eye (or mastication) but not the parasympathetic pupillary pathway.

Parasympathetic control of the pupil comes from the oculomotor nerve. Preaganglionic parasympathetic fibers originate in the Edinger–Westphal nucleus and travel with CN III to the ciliary ganglion. There they synapse, and the postganglionic fibers ride with the short ciliary nerves to the sphincter pupillae, causing pupil constriction (miosis). The other nerves don’t carry parasympathetic efferents to the sphincter pupillae: they either provide motor or sensory functions for the eye (or mastication) but not the parasympathetic pupillary pathway.

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