HANS-ULRICH OSTERWALDER / SCIENCE PHOTO LIBRARY HANS-ULRICH OSTERWALDER / SCIENCE PHOTO LIBRARY
Bone anatomy. Computer artwork showing the anatomy of a normal bone shaft. An outer layer of compact bone is made up of cylindrical units (osteons, black stripes). Inside these are blood vessels to bring blood to and from the bone, and also carry away newly formed blood cells from the bone marrow in the interior of the bone. The blood vessels are part of the venous (blue) and arterial (red) blood systems. Running beside them are nerves (yellow). The honey-combed structure (left) at the centre of a bone shaft is called cancellous or spongy bone. It contains the bone marrow where new blood cells are formed.
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