JOHN BAVOSI / SCIENCE PHOTO LIBRARY JOHN BAVOSI / SCIENCE PHOTO LIBRARY
Brain's visual pathways. Artwork of the visual pathways from the eyes (top) to the cortex of the brain (bottom), as seen from below. Nerve impulses produced when light falls on the retinas of the eyes travel along the optic nerves. The images are binocular. Light that falls on the right side of each retina (blue) from the left field of view, passes as impulses to the right visual cortex of the brain via the chiasma (crossing point of the optic nerves). This is reversed for light that falls on the left side of the retina (coloured red). The nerve impulses are processed in the brain to create a coherent image of what is seen by the eyes.
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