ZEPHYR / SCIENCE PHOTO LIBRARY ZEPHYR / SCIENCE PHOTO LIBRARY
Human head. Coloured 3D computed tomography (CT) scan of a profile view of a 47 year old patient's head. The brain is purple and bone is light brown. At centre, behind the face, are the sinuses. These are membrane-lined air-filled spaces in the bones of the face that lighten the skull and add resonance to the voice.
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