Skeletal tissues Classification and functions

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Presentation transcript:

Skeletal tissues Classification and functions Chondroid tissue cells, inter-cellular substance Histogenesis of cartilages Cartilages: a) hyaline; b) elastic; c) fibrocartilage 5. Bony tissue cells, intercellular substance 6. Fibrous bones 7. Lamellar bones 8. Long bones 9. Osteogenesis

Skeletal tissues Chondroid tissue Bony tissue Hyaline Elastic Fibrocartilage Bony tissue Fibrous bone Lamellar bone: a) cancellous b) compact

Functions 1. Supportive 2. Mechanical 3. Protective 4. Ca and P deposition 5. Water-mineral metabolism

Chondroid tissue Cells + intercellular substance (chondromucoid, chondrine fibers) 1. Has no vessels 2. Intercellular components are predominant 3. Chondromucoid 70-80 % H2O 10-15 % org. 4-7 % mineral 4. Chondrine fibers Collagen II Elastic

Chondroid tissue differon I Stem cell II Hemistem cells III Chondroblasts IV Chondrocytes Chondroclasts

Differon stem cell hemistem cell chondroblasts chondrocytes

Cartilage

Hyaline cartilage

Elastic cartilage Resorcin stain

Fibrocartilage

Bony tissue cells + matrix (osteoid+ossein fibers+salts) Supports fleshy structures Protects organs Harbors the bone marrow Storage of Ca and P Multiply the forces of skeletal muscle contraction

Osteocyte

Osteoclast

Bones 1. Fibrous 2. Lamellar (compact and cancellous)

Diaphysis

Haversian system

Histogenesis 1. Intramembranous 2. Endochondral

1. Osteogenic islet 2. Osteoid stage 3. Salts impregnation 4 1. Osteogenic islet 2. Osteoid stage 3. Salts impregnation 4. Replacement by lamellar bone

Endochondral histogenesis

Endochondral ossification 1. Cartilage model 2. Perichondral ossification 3. Endochondral ossification 4. Epiphyseal ossification

Epiphyseal plate

Regeneration

Joint

Joint

Regulation