Optic nerve is formed by the axons of retinal ganglionic cells, which leaves the eye through optic disk. Optic nerves transmit the sensations to the brain. The medial fibres (of optic nerves) of both sides cross at optic chiasma, which is present near the center of the base of cerebral cortex.
The two retinal pathways that project into the brain are,
1). Geniculostriate pathway
2). Tectopulvinar pathway
Thus, the blanks can be filled with geniculostriate pathway; tectopulvinar pathway.