Bone Tissue

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

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Cells Osteocytes

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

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Cells Osteoclasts

• Large number of nuclei
• Constant remodeling
• Resorps bone
• Froms grooves and cavities
• Howships lacunae

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Matrix Amorphous Ground Substance

• 60 70 anorganic material
• Calcium phosphate
• Organic substance
• Cementing substance

Matrix Fibres

• Collagen fibres

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Architecture of Compact Bone

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

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Haversian Systems

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

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Circumferential Lamellae

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

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Interstitial Lamellae

• Constant remodeling
• Partly removed Haversian system

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

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Diagram of Cross Section of Bone
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Architecture of Spongy Bone

• Spongy appearance
• Few lamellae
• Some Haversian systems