Caption: Bone cell (osteocyte, purple) in a bone lacuna (yellow) from a fractured compact bone (brown). A bone-producing cell is called an osteoblast. During bone formation osteoblasts become progressively trapped in the bone matrix at sites called lacunae (yellow). The osteoblast produces osteoid, the organic bone matrix that is a mass of collagen fibers 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 (yellow) in the bone become osteocytes. The osteocyte (purple) has many processes or thread-like extensions that enter the bone through the bone canaliculi (turquoise), a network of minute channels linking nearby lacunae. Compact bone is made of collagen fibers and ground substances arranged in concentric sheets.
Magnification*: x2,000
Type: SEM
Copyright 2007 Dennis Kunkel Microscopy, Inc.
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