Where do the nasal retinal fibers cross to the opposite side in the visual pathway?

Where do the nasal retinal fibers cross to the opposite side in the visual pathway?

• A. Lateral geniculate body
• B. Optic nerve
• C. Superior colliculus
• D. Optic chiasm

Answer: (D)

Nasal retinal fibers cross to the opposite side at the optic chiasm. This is where the fibers from the nasal half of each retina decussate, while the fibers from the temporal half stay on the same side. The result is that information from the left visual field of both eyes is routed to the right hemisphere, and information from the right visual field goes to the left hemisphere. After crossing, the fibers continue as the optic tract to the lateral geniculate body and then to the visual cortex.

Nasal retinal fibers cross to the opposite side at the optic chiasm. This is where the fibers from the nasal half of each retina decussate, while the fibers from the temporal half stay on the same side. The result is that information from the left visual field of both eyes is routed to the right hemisphere, and information from the right visual field goes to the left hemisphere. After crossing, the fibers continue as the optic tract to the lateral geniculate body and then to the visual cortex.