POWER AND SYRED / SCIENCE PHOTO LIBRARY POWER AND SYRED / SCIENCE PHOTO LIBRARY
Deer antler. Coloured scanning electron micrograph (SEM) of a transverse section through cortical (compact) bone from the antler of a deer. The larger spaces seen here are Haversian canals, which contain blood and lymph vessels and nerves. The smaller spaces, known as lacunae, house the osteocytes, the bone-forming cells. Antlers consist entirely of bone and are shed every year. Magnification: x200 when printed at 10 centimetres across.
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