Bone cells in a fractured compact bone, SEM

Bone cells in a fractured compact bone, SEM

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Caption: Bone cells (osteocytes, orange) in bone lacunae (blue) from a fractured compact bone (brown), coloured scanning electron micrograph (SEM). A bone-producing cell is called an osteoblast. During bone formation osteoblasts become progressively trapped in the bone matrix at sites called lacunae (blue). The osteoblast produces osteoid, the organic bone matrix that is a mass of collagen fibres and glycoprotein cement. As soon as osteoid is formed, calcium salts crystallize inside it to form mineralized, compact bone. Osteoblasts that become trapped in lacunae (blue) in bone become osteocytes. The osteocyte (orange) has many processes or thread-like extensions that enter the bone through the bone canaliculi, a network of minute channels linking nearby lacunae. Compact bone is made of collagen fibres and ground substances arranged in concentric sheets. Magnification: x80 when shortest axis printed at 25 millimetres.

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