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The light reflex pathway consisting of the ganglion cell output of the
retina,which synapses with the neurons in the ipsilateral pretectal olivary
nucleus.
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The neurons in the pretectal nucleus send crossed and uncrossed fibers
to the neurons in the visceral portion of the Edinger-Westphal nucleus
on both sides.
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These neurons form the preganglionic parasympathetic nerves that travel
within the third nerve to synapse in the orbit at the ciliary ganglion.
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Postganglionic parasympathetic nerve fibers pass from the ciliary ganglion
to the eye through the short ciliary nerves to innervate the iris sphincter.
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