Compact Bone - Done

Location of compact bone

Outer layer of bone and forms the shaft of long bones

Components of compact Bone CT

Rod shaped units (Osteons or Haversian systems)

Function of Compact bone

Stores Calcium and phosphorus, protection and support

4 cell types in bone

Osteogenic, osteoblasts, osteocytes, osteoclasts

Osteogenic cells

mesenchymal stem cells, lay down collagen, become trapped and become osteoblasts

Osteoblasts

bone forming cells, lay down collagen, mineralization process starts

Osteocytes

Mature bone cells, made from osteoblasts trapped in ECM. Have gap junctions

function of osteocytes

Maintain bone tissue, exchange of nutrients and wastes

Osteoclasts

multinucleated cells formed from the fusion of blood monocytes. Breaks down bone for calcium

4 parts of osteons

Lamellae, lacunae, canaliculi, Central canal

Lamellae

Concentric rings of minerals salts for hardness and collagen

Lacunae

small spaces between lamellae that contain osteocytes

Canaliculi

minute canals that radiate from lacunae and provide routes for oxygen, nutrients and waste

Central canal

Haversian canal include blood, lymph and nerves