3. Component of bone
• Organic matrix
- Type I collagen: Osteoid + proteoglycan
- Type II collagen: cartillage
• Inorganic component
eg; Ca hydroxyapatite
• Cells
- Osteoprogenitor
- Osteoblast
- Osteocytes
-Osteoclast
• Tissue: Periosteum
4. Bone formation
• Production of Osteoid
• Mineralization of osteiod
• Remodelling by resoption & reformation
Osteoblast (Production)
Osteoid (Mineralization)
Woven bone (Remodelling)
Lamellar bone.
17. Malignancies
• Malignant Primary (what it produce)
Secondary (metastasis)
*most common bone tumours in children and
young adult Primary Bone Tumours
* most common bone tumours in older adult
Myeloma and Mets from other site (brest,
prostate, lung, kidney)
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
An osteocyte, a star-shaped cell, is the most abundant[citation needed] 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.
Up to fifty percent of bone is made up of a modified form of the inorganic mineral hydroxylapatite (known as bone mineral).[
Ossification (or osteogenesis) is the process of laying down new bone material by cells