The<unk>  is a part of the visual system in the brain.
It is a continuation of the optic nerve and runs from the optic chiasm (where half of the information from each eye crosses sides, and half stays on the same side) to the lateral geniculate nucleus.
Optic tract
Optic chiasm
Cochlear nuclei
Cranial nerve nucleus
Optic stalk
Eyelid
Vestibular system
Lens 