ZEPHYR / SCIENCE PHOTO LIBRARY ZEPHYR / SCIENCE PHOTO LIBRARY
Trachea-bronchi division. Coloured 3D computed tomography (CT) scan of point where the trachea (windpipe) divides into the two primary bronchi to enter the lungs. This region is known as the carina. This scan is of the trachea of a 30-year-old man.
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