Which statement about the optic nerve is true?

Which statement about the optic nerve is true?

• A. Detects color vision
• B. Transmits auditory signals
• C. Responds to touch
• D. Carries visual information from the retina to the brain

Answer: (D)

The optic nerve is the bundle of retinal ganglion cell axons that carries visual information from the retina to the brain. Photoreceptors in the retina detect light and color, convert it into electrical signals, and these signals travel along the retinal neurons into the optic nerve. From there they reach the brain through pathways that involve the optic chiasm and the thalamus before reaching the visual cortex, where we actually perceive sight. That makes the statement about the optic nerve transmitting visual information from the retina to the brain true. The other ideas mix up senses or functions: auditory signals are carried by the hearing pathways, not the optic nerve; touch is processed by somatosensory pathways; and color vision is determined by cones in the retina, with the nerve simply transmitting the resulting signals rather than detecting color itself.

The optic nerve is the bundle of retinal ganglion cell axons that carries visual information from the retina to the brain. Photoreceptors in the retina detect light and color, convert it into electrical signals, and these signals travel along the retinal neurons into the optic nerve. From there they reach the brain through pathways that involve the optic chiasm and the thalamus before reaching the visual cortex, where we actually perceive sight. That makes the statement about the optic nerve transmitting visual information from the retina to the brain true. The other ideas mix up senses or functions: auditory signals are carried by the hearing pathways, not the optic nerve; touch is processed by somatosensory pathways; and color vision is determined by cones in the retina, with the nerve simply transmitting the resulting signals rather than detecting color itself.