When light shines on the left eye, the temporal nerve fibres of the left eye will be transmitted to its pretectal nucleus, and then to ipsilateral Edinger Westphal Nucleus. It then passes to its ipsilateral ciliary ganglion via its parasympathetic nerve. Then, the information goes on to the left sphincter through the short ciliary nerve. This marks the direct papillary pathway.
At the same time when information is passed from the temporal nerve fibres to its ipsilateral pretectal nucleus, nasal nerve fibres are also passed to contralateral pretectal nucleus. From the contralateral pretectal nucleus, it branches its information out to ipsilateral and contralateral Edinger Westphal Nucleus. From the ipsilateral Edinger Westphal Nucleus, information is also passed on to ipsilateral ciliary ganglion via the parasympathetic nerve. Information is then passed to the sphincter of right eye via short ciliary nerve to also constrict. This marks the consensual papillary pathway.
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