Which structure carries signals from the retina to the visual cortex of the brain?

Which structure carries signals from the retina to the visual cortex of the brain?

• A. Retina
• B. Lens
• C. Iris
• D. Optic nerve

Answer: (D)

Signals involved in vision are generated in the retina when photoreceptors respond to light. These electrical signals are then carried onward by the axons of retinal ganglion cells, which bundle together to form the optic nerve. The optic nerve transports these signals toward the brain, where they reach the visual cortex for processing into images. The lens is responsible for focusing light, and the iris controls pupil size; neither carries signals to the brain. So the structure that carries signals from the retina to the visual cortex is the optic nerve.

Signals involved in vision are generated in the retina when photoreceptors respond to light. These electrical signals are then carried onward by the axons of retinal ganglion cells, which bundle together to form the optic nerve. The optic nerve transports these signals toward the brain, where they reach the visual cortex for processing into images. The lens is responsible for focusing light, and the iris controls pupil size; neither carries signals to the brain. So the structure that carries signals from the retina to the visual cortex is the optic nerve.