20615B

20615B
Caption: Bone cells (osteocytes, organge) in bone lacunae (blue) 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 (blue). 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 (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 fibers and ground substances arranged in concentric sheets.
Magnification*: x80
Type: SEM
Copyright 2008 Dennis Kunkel Microscopy, Inc.
Keywords: SEM,bone,bone fracture,09.01.08,20615B,medical,bones,bone cavity,bone cavities,bone cell,bone cells,bone lacuna,bone lacunae,bone canaliculi,bone collagen,bone glycoprotein,bone mineral,bone producing cell,bone-producing cell,bone organic matrix,bone matrix,calcium,bone calcium,caniculus,caniculi,collagen,collagen fibers,glycoprotein,glycoprotein cement,compact bone,lacuna,lacunae,organic matrix,osteocyte,osteocytes,osteoblast,osteoblasts,osteoid,organic bone,calcium salt,calcium salts,calcium carbonate,mineralized bone,cortical bone,fractured bone