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Stimulus: Changes in light intensityReceptor: Retina of the eye, specifically the photoreceptors (rods and cones).Afferent Limb: Optic nerve (cranial nerve II)Synapse(s): Optic nerve fibers synapse at the pretectal nucleus in the midbrain.Efferent Limb: Preganglionic parasympathetic fibers from the Edinger-Westphal nucleus.Response: Constriction (miosis) or dilation (mydriasis) of the pupil to regulate the amount of light entering the eye
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