Which structure relays visual information from the eyes to the visual cortex?

• A. Optic nerves & chiasm
• B. Visual cortex
• C. Temporal lobe
• D. Brain stem

Answer: (A)

Understanding the path of vision: visual information travels from the retina into the brain through the optic nerves. At the optic chiasm, the fibers from the nasal half of each retina cross to the opposite side, while the temporal fibers stay on their own side. This crossing ensures that information from the left visual field ends up in the right hemisphere and vice versa, preparing the signal to reach the correct processing areas. From there, the information continues through the optic tracts to the thalamus (the lateral geniculate nucleus) and then to the primary visual cortex in the occipital lobe, where processing begins. The optic nerves and chiasm are the structures that relay the signal from the eyes toward the cortex, making them the best answer. The visual cortex is where interpretation happens, not the relay, and the temporal lobe or brain stem are not the primary pathways for conveying this direct route to the visual cortex.