HERVE CONGE, ISM / SCIENCE PHOTO LIBRARY HERVE CONGE, ISM / SCIENCE PHOTO LIBRARY
Bone canals. Polarized light micrograph of a cross-section through human compact bone, showing two Haversian canals (round, centre right and centre left). The concentric rings surrounding the Haversian canals are called lamellae. The canals run along the long skeletal bones, and contain blood vessels, lymphatic vessels, and nerves. The lamellae are made of compacted collagen fibers and minerals produced by bone-forming cells that are called osteoblasts. The osteoblasts become trapped in the bone matrix at sites called lacunae (small black areas). Magnification: x285 when printed 10cm wide.
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