Bone Tissue Skeleton Types Spongy bone Compact bone

Bone Tissue

• Skeleton • Types • Spongy bone • Compact bone • Components • Cells • Osteocytes in lacunae • Osteoclasts • Matrix • Collagen fibres • Amorphous ground substance • Blood supply

Cells: Osteocytes • • Matured osteoblasts Oval with thin processes Connection between processes In matrix • Cell in lacunae • Processes in canaliculi • Form matrix

Cells: Osteoclasts • • Large number of nuclei Constant remodeling Resorps bone Froms grooves and cavities • Howship’s lacunae

Matrix: Amorphous Ground Substance • 60 – 70% anorganic material • Calcium phosphate • Organic substance • Cementing substance Matrix: Fibres • Collagen fibres

Architecture of Compact Bone • Shaft of long bone • Lamellae (layers) • Depending on blood vessels • Systems • Haversian system • Interstitial system • Circumferential systems • Inside and outside

Haversian Systems • Blood vessels and nerves • Bony canals • Haversian canal • Cross section • Lacunae in concentric circle • Canaliculi • Matrix • Lamellae • Concentric cylinders

Circumferential Lamellae • Parallel layers of bone • Outer surface • Circumference • Inner surface • Bone marrow cavity

Interstitial Lamellae • Constant remodeling • Partly removed Haversian system

• Periosteum • Outer surface • Regular dense connective tissue • Endosteum • Inner surface of bone marrow cavity • Reticular connective tissue

Diagram of Cross Section of Bone

Architecture of Spongy Bone • Spongy appearance • Few lamellae • Some Haversian systems