Osteocyte, SEM

Osteocyte, SEM

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Credit: STEVE GSCHMEISSNER/SCIENCE PHOTO LIBRARY

Caption: Osteocyte. Coloured scanning electron micrograph (SEM) of a freeze-fractured osteocyte (purple) surrounded by bone (grey). An osteocyte is an osteoblast (a bone-producing cell) that has become trapped within a bone cavity. The fracture plane has revealed details of the internal cell structure, including a large, dark concave region that was the site of the cell nucleus. Osteoblasts produce the organic matrix of bone that is called osteoid. This consists of a mass of collagen fibres and a glycoprotein cement. As soon as osteoid is formed, calcium salts crystallize inside it to form hard, mineralised bone. Magnification: x4000 at 6x7cm size.

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Keywords: anatomy, bone, bones, cell, coloured, fracture, fractured, freeze-fracture, freeze-fractured, histological, histology, human body, images, magnified image, microscopic photos, nucleus, osteoblast, osteocyte, osteoid, plane, scanning electron micrograph, section, sectioned, sem, subjects

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