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Chapter 3 Tissue Development, Repair, & Unusual Growth.

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Presentation on theme: "Chapter 3 Tissue Development, Repair, & Unusual Growth."— Presentation transcript:

1 Chapter 3 Tissue Development, Repair, & Unusual Growth

2 Germ Layers & Specialization Endoderm Ectoderm Mesoderm

3 Specialization

4 Developmental Aspects of Tissue  Epithelial tissue -germ layers: endoderm, mesoderm, ectoderm  Muscle and Connective tissue -mesoderm  Nervous tissue -ectoderm  Old age = decrease in mass & viabililty

5 Tissue Repair 1. Regeneration  Replacement by the same kind of cells 2. Fibrosis  Repair by dense fibrous connective tissue (scar tissue) 3. Determination of method  Type of tissue damaged  Severity of the injury

6 Events in Tissue Repair 1.Capillaries become very permeable  Clotting proteins leak through  Clot walls off injured area 2. Formation of granulation tissue  Many capillaries and WBCs 3. Regeneration of surface epithelium  Develops beneath scab  Over the scar

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8 Regeneration of Tissues  Tissues that regenerate easily - Epithelial tissue - Fibrous connective tissue and bone  Tissues that regenerate poorly - Skeletal muscle  Tissues that are replaced largely with scar tissue (amitotic at maturity) - Cardiac muscle - Nervous tissue within the brain and spinal cord

9 Changes in Growth Patterns 1.Neoplasm – mitosis gone crazy; tumor Benign – doesn’t spread; stays local Malignant – cancerous; invades; spreads via blood – called metastisis Carcinogens – agents that cause cancer; build up of mutations

10 2. Hyperplasia – temporary enlargement of localized tissues; i.e. breasts during pregnancy; can be normal or abnormal

11 3. Atrophy – decrease in size due to lack of use


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