Describe the pupillary light reflex pathway.
(Iris Sphrinter)
ON to optic tract to brachium of superior colliculus synapsing in the pretectal nucleus the to bilateral EWN to CN3. Parsympathetic innervation from CN3 splits in anterior cavernous sinus pass through SO with inferior division of CN3. In orbital apex it synapses in ciliary ganglion then traveling with fibers going to IO to posterior ciliary nerves then to pupillary sphincter.