Fig. 16.

Schematic of pupillary light reflex pathways. The retina projects bilaterally to OPt and synapses directly onto output neurons (only the left eye is shown). OPt output neurons project bilaterally to preganglionic motoneurons in EWpg. These motoneurons project to postganglionic motoneurons in the ciliary ganglion that innervate the sphincter pupillae muscle to produce pupillary constriction. Other preganglionic motoneurons supply the postganglionic motoneurons in the ciliary ganglion that innervate the ciliary muscle to produce lens accommodation. There is also a feedback pathway. The OPt output neurons supply bilateral input to cells in the lvc. These cells project back to contralateral OPt