MIRIAM MASLO / SCIENCE PHOTO LIBRARY MIRIAM MASLO / SCIENCE PHOTO LIBRARY
Normal brain, coloured axial (cross-sectional) computed tomography (CT) scan. The front of the head is at top. The brain is yellow (lower centre). The blue circles at upper left and right are the eyeballs. Behind them are sinuses (orange), which are air-filled spaces lined with mucous membranes.
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