What transmits impulses from the retina to the brain?

The optic nerve is responsible for transmitting visual impulses from the retina to the brain. When light hits the photoreceptor cells in the retina, it triggers a biochemical response that converts the light signals into electrical impulses. These impulses are then carried by the optic nerve, which is composed of the axons of retinal ganglion cells, directly to the brain for processing. The primary destination for these visual signals is the visual cortex, where the information is interpreted to form images.

In contrast, the ciliary body is involved in controlling the shape of the lens and regulating the production of aqueous humor, but it does not transmit visual information. The cornea is the transparent front part of the eye that covers the lens and retina and plays a role in focusing light, but it also does not transmit impulses. Lastly, the sclera is the white outer coat of the eyeball that provides structural support, but like the other options, it does not have a role in transmitting visual impulses to the brain. Thus, the optic nerve is the crucial component in connecting the eye to the brain for vision.