FIGURE 9-11 Main Visual Pathways into the Brain The optic nerve follows (1) the geniculostriate path to the primary visual cortex and (2) the tectopulvinar path to the temporal and parietal lobes. (The LGN of the thalamus is part of the diencephalon, shown in Figure 2-19; the superior colliculus in the tectum is part of the midbrain, shown in Figure 2-18.)