• Osteoblast
  Osteoblast
  Osteoblasts are mononucleate cells that are responsible for bone formation; in essence, osteoblasts are specialized fibroblasts that in addition to fibroblastic products, express bone sialoprotein and osteocalcin.Osteoblasts produce a matrix of osteoid, which is composed mainly of Type I collagen...
  
  s - These are commonly called bone-forming cells. They secrete osteoid
  Osteoid
  In histology, osteoid is the unmineralized, organic portion of the bone matrix that forms prior to the maturation of bone tissue. Osteoblasts begin the process of forming bone tissue by secreting the osteoid as several specific proteins...
  
  , which forms the bone matrix. They also begin mieralization
  Mineralization (biology)
  In biology, mineralization refers to the process where an organic substance is converted to an inorganic substance.This may also be a normal biological process which takes place during the life of an organism such as the formation of bone tissue or egg shells, largely with calcium.This term may...
  
  , and are unable to divide.
• Osteocyte
  Osteocyte
  An osteocyte, a star-shaped cell, is the most abundant cell found in compact bone. Cells contain a nucleus and a thin ring of cytoplasm. When osteoblasts become trapped in the matrix they secrete, they become osteocytes...
  
  s - A mature osteoblast which no longer secretes matrix, yet is surrounded by it. Maintains metabolism, and participates in nutrient/waste exchange via blood. Unable to divide.
• Osteoclast
  Osteoclast
  An osteoclast is a type of bone cell that removes bone tissue by removing its mineralized matrix and breaking up the organic bone . This process is known as bone resorption. Osteoclasts were discovered by Kolliker in 1873...
  
  s - These function in resorption and degradation of existing bone, the opposite of osteoblasts. Monocytes (a type of white blood cell) fuse together to create these huge cells, which are concentrated in the endosteum
  Endosteum
  In anatomy the endosteum is a thin layer of connective tissue that lines the surface of the bony tissue that forms the medullary cavity of long bones. This endosteal surface is usually resorbed during long periods of malnutrition, resulting in less cortical thickness...
  
  .
• Osteoprogenitors - Immature cells which differentiate
  Cellular differentiation
  In developmental biology, cellular differentiation is the process by which a less specialized cell becomes a more specialized cell type. Differentiation occurs numerous times during the development of a multicellular organism as the organism changes from a simple zygote to a complex system of...
  
   to make osteoblasts. May divide.
• bone-lining- quiescent osteoblasts covering the bone

See also

• Chondroblast
  Chondroblast
  A chondroblast is a cell which originates from a mesenchymal stem cell and forms chondrocytes, commonly known as cartilage cells. Chondroblasts that become embedded in the matrix are called chondrocytes. They lie in the space or lacunae present in the groups of two or more. The groups are formed by...
  
  
• Epiphyseal plate
  Epiphyseal plate
  The epiphyseal plate is a hyaline cartilage plate in the metaphysis at each end of a long bone...
  
  
• Mesenchymal stem cell
  Mesenchymal stem cell
  Mesenchymal stem cells, or MSCs, are multipotent stem cells that can differentiate into a variety of cell types, including: osteoblasts , chondrocytes and adipocytes...
  
  
• Perichondrium
  Perichondrium
  The perichondrium is a layer of dense irregular connective tissue which surrounds the cartilage of developing bone. It consists of two separate layers: an outer fibrous layer and inner chondrogenic layer. The fibrous layer contains fibroblasts, which produce collagenous fibers. The chondrogenic...
  
  
• Periosteum
  Periosteum
  Periosteum is a membrane that lines the outer surface of all bones, except at the joints of long bones. Endosteum lines the inner surface of all bones....