BISC 101 Lecture Notes - Lecture 5: Weight-Bearing, Patella, Metaphysis
20 Oct 2012
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3. storage of minerals like calcium and phosphate (mineral homeostasis) 4. blood cell production in red bone marrow (hemopoiesis) Osteogenic cells: undifferentiated cells, can divide to replace themselves when they become osteoblasts, found in the inner layer of periosteum and endosteum, periosteum tough outer membrane of bone, endosteum inner lining of marrow cavity. Osteoblasts: forms matrix and collagen fibers by secreting mineral salts, can"t divide any further, responsible for forming bone tissue. Osteocytes: mature osteoblasts, can"t secrete matrix anymore, responsible for maintaining bone tissue. Osteoclasts: huge cells formed from fused monocytes (wbc"s, functions in bone resorption, destroys older matrix to maintain proper bone girth. Compact (dense) bone: solid layer of bone, makes up the shaft of long bones and external layer of all bones, resists stresses produced by weight and movement. Hyaline cartilage: bluish-shiny white rubbery substance, chondrocytes sit in spaces called lacunae, no blood vessels or nerves so repair is very slow, reduces friction at joints (articular cartilage)
