ZEPHYR / SCIENCE PHOTO LIBRARY ZEPHYR / SCIENCE PHOTO LIBRARY
Human eyes and brain. Coloured axial magnetic resonance imaging (MRI) scan of the eyes (top) and part of the brain of a 48-year-old woman. The scan shows the normal structures, including the eyeballs and the optic nerves. Also visible are the arteries and veins bringing blood to and from the retina.
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