The right and left optic (chiasm/nerves/tracts) originate at the posterior/medial aspect of the orbit. They travel posteriorly, and most fibers cross at the optic (chiasm/nerves/tracts). This crossing occurs (anterior/posterior) to the infundibulum. After the crossing, the fibers then project to the thalamus via the optic (chiasm/nerves/tracts). The tectal plate is composed of two structures. The (inferior/superior) colliculus, which plays a role in visual reflexes, and the (inferior/superior) colliculus, which plays a role in auditory reflexes. The tectal plate is (larger/smaller) in the sheep brain than in the human brain because sheep behavior is influenced (less/more) by visual and auditory reflexes than human behavior.