Site of preganglionic nerve cells that elicit constriction of pupil?

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Multiple Choice

Site of preganglionic nerve cells that elicit constriction of pupil?

Explanation:
Pupil constriction (miosis) is driven by parasympathetic neurons. The cell bodies of the preganglionic parasympathetic neurons are located in the Edinger-Westphal nucleus in the rostral midbrain. These fibers travel with the oculomotor nerve to the ciliary ganglion, where they synapse onto postganglionic neurons. The postganglionic fibers then reach the sphincter pupillae to cause constriction. The lateral horn houses sympathetic preganglionic neurons and is not involved in this pathway. The ciliary ganglion contains postganglionic cell bodies, not preganglionic. The oculomotor nerve carries the preganglionic fibers, but the actual cell bodies reside in the Edinger-Westphal nucleus.

Pupil constriction (miosis) is driven by parasympathetic neurons. The cell bodies of the preganglionic parasympathetic neurons are located in the Edinger-Westphal nucleus in the rostral midbrain. These fibers travel with the oculomotor nerve to the ciliary ganglion, where they synapse onto postganglionic neurons. The postganglionic fibers then reach the sphincter pupillae to cause constriction.

The lateral horn houses sympathetic preganglionic neurons and is not involved in this pathway. The ciliary ganglion contains postganglionic cell bodies, not preganglionic. The oculomotor nerve carries the preganglionic fibers, but the actual cell bodies reside in the Edinger-Westphal nucleus.

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