GCA / SCIENCE PHOTO LIBRARY GCA / SCIENCE PHOTO LIBRARY
Human skull. Three-dimensional computed tomography (CT) scan of the human skull seen from above, with the top of the cranium removed. The cranium chamber (at upper centre) houses the brain. At centre is the foramen magnum, the hole in base of the skull through which the spinal cord passes. The petrous portion of the temporal bone (at far left and right) contains the petrosal sinus (at centre). The orbits (eye sockets), nasal bones and maxillae (upper jaw) are at lower centre. Zygomatic arches (at lower left and right) form the cheek bones. CT scans use X-rays to form "slices" of body tissue. These are built up into a three-dimensional image by computer.
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