STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Spongy bone. Coloured scanning electron micrograph (SEM) of human spongy (cancellous) bone. This type of bone tissue is found deep inside bones, below a dense shell of hard "compact" bone. It consists of a network of hard trabeculae (bars) separated by interconnected spaces, giving a mesh-like structure. In some bones these spaces are filled with bone marrow, a living tissue which manufactures blood cells. Although it appears fragile, spongy bone has an important supportive and strengthening role. Magnification unknown.
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