• Bone (osseous) CT

– Cells

• Osteoprogenitor cells (stem cells)

• Osteoblasts

• Osteocytes (in lacunae)

• Osteoclasts

– Matrix: arranged as lamellae

• Collagen fibers

• Calcium phosphate salts (as hydroxyapatite)

• Arrangements of Bone Tissue

– Compact (cortical)

• Location

– On bone surfaces (matrix arranged as circumferential lamellae)

– In shafts of long bones (matrix arranged as concentric and interstitial lamellae)

– The osteon (Haversian system): unit structure of thick compact bone

– Spongy (cancellous) bone tissue

• Location: within bones

• Consists of branching plates called trabeculae

• Bone marrow found between the trabecular spaces

• Periosteum

– Fibrous layer

– Cellular layer

• Source of new osteoblasts

• Bone Tissue Remodeling

– Osteoblasts

– Osteoclasts