ALFRED PASIEKA / SCIENCE PHOTO LIBRARY ALFRED PASIEKA / SCIENCE PHOTO LIBRARY
Lungs. Coloured axial CT (computed tomography) scan through the upper chest of a 52-year-old woman. The front of the chest is at top, and the right of the body is at left. The two lungs (dark blue) and their branching airways (bronchioles, light blue) are divided by the mediastinal area (centre). At this level, this area contains the trachea (blue circle), and two major heart blood vessels (orange, centre). The oval shape to the right of the trachea is the arch of the aorta, the largest artery in the body. Above and left of the trachea is the superior vena cava vein. The bone (dark orange) of the spine (lower centre) and ribs (surrounding the lungs) is also seen.
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