DR TONY BRAIN / SCIENCE PHOTO LIBRARY DR TONY BRAIN / SCIENCE PHOTO LIBRARY
False-colour scanning electron micrograph (SEM) of cancer of the human bronchus - the most common form of lung cancer. Such cancers often occur near the point where the trachea, or windpipe, forks to form the 2 bronchi, since this area suffers from heavy deposition of the carcinogenic tars from tobacco smoke. The disorganised region of malignant tumour cells at bottom right is seen invading the normal ciliated epithelium, or lining, of the bronchus at left & top. Cancers consist of primitive cells which have not developed any function, such as the cilia of normal bronchial epithelial cells. Magnification: x110 at 6x4.5 cm size. Reference: MICROCOSMOS, figure 2.33, page 32.
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