Connective Tissue PDF

GENERAL CHARACTERISTICS: connective tissue Letters ✔ ✔ ✔ ✔ Syllabes Words Sentences Cells rarely touch due to “extracellular matrix.” Matrix (fibers & ground substance) is secreted by cells. Consistency varies: liquid, gel or solid. Good nerve & blood supply except in cartilage & tendons. © Co...

GENERAL CHARACTERISTICS: connective tissue Letters ✔ ✔ ✔ ✔ Syllabes Words Sentences Cells rarely touch due to “extracellular matrix.” Matrix (fibers & ground substance) is secreted by cells. Consistency varies: liquid, gel or solid. Good nerve & blood supply except in cartilage & tendons. © Copyright Universidad Europea. Todos los derechos reservados GENERAL CHARACTERISTICS Abundant and widely distributed. Derives from mesoderm. Cells are derived from MESENCHYME (embryonic connective tissue): mesenchymal cells (MSCs) ▪ Immature cells have names that end in –blast (e.g., fibroblast, chondroblast). ▪ Mature cells have names that end in -cyte (e.g., osteocyte). Ectoderm Mesoderm Endoderm -BLAST -CYTE © Copyright Universidad Europea. Todos los derechos reservados GENERAL CHARACTERISTICS FUNCTIONS · Bind, support, repair and strengthen other tissues. · Protect and insulate internal organs. · Compartmentalize structures (muscles). · Transport (blood). · Storage: ▪ Energy reserves (adipose tissue). ▪ Water and electrolytes in extracellular matrix. · Immune response. © Copyright Universidad Europea. Todos los derechos reservados COMPONENTS of CONNECTIVE tissue CELLS + EXTRACELLULAR MATRIX RESIDENT TRANSITORY FIBRES -Immature (-blast) -Mature (-cyte) - Leucocytes - Macrophages - Mastocytes - Plasma cells - Collagen - Reticular - Elastic © Copyright Universidad Europea. Todos los derechos reservados GROUND SUBSTANCE - Water - Salts - Proteoglycans Flexible CELLULAR COMPONENTS RESIDENT (non recruited) - Immature (-blast) - Mature (-cyte) © Copyright Universidad Europea. Todos los derechos reservados TRANSITORY -Leucocytes -Macrophages -Mast cells -Plasma cells MESENCHYMAL CELLS • • • Multipotent and undifferentiated. Star-like shape, they differentiate into other cellular types. They normally exist during embryonic stages, but some could last through adulthood. RELEVANCE TO TEETH. Mesenchymal cells form the following differentiated cells: dentin forming odontoblasts, pulp, periodontal ligament. Endometrial mesenchymal cells © Copyright Universidad Europea. Todos los derechos reservados MESENCHYMAL CELLS Some cells into which they differentiate Mesenchymal cell Chondrobla Adipocyt e st Fibroblas t Chondrocyt es © Copyright Universidad Europea. Todos los derechos reservados Mesotheli al Cell Endothelia Osteoblas l t Cell Osteocyt e FIBROBLASTS ▪ Large flat cells with star-like shape. ▪ Principal active cells of connective tissue. They are in various connective tissues. ▪ They produce FIBRES (collagen and elastic fibres) and the GROUND SUBSTANCE Mouse fibroblasts (amorphous gel-like matrix that fills spaces between cells and fibres). Fibrocytes are mature cells that are trapped within the extracellular matrix and maintain the connective tissue. © Copyright Universidad Europea. Todos los derechos reservados Fibroblast MYOFIBROBLASTS ▪ Modified fibroblasts. ▪ Properties between fibroblasts and smooth muscle cells: they secrete collagen and can also contract. ▪ Abundant in healing areas and in the periodontal ligament. ▪ Actively participate in the formation of the root of the teeth. © Copyright Universidad Europea. Todos los derechos reservados ADIPOCYTES ▪ Form adipose tissue and do not divide by mitosis. ▪ Each adipocyte is surrounded by a net of reticular fibres. ▪ They store triglycerides. ▪ We can find them beneath the skin and around internal organs such as heart and kidneys. ▪ Function: protection, energy store, thermoregulation. ▪ Also known as fat cells or lipocytes. © Copyright Universidad Europea. Todos los derechos reservados CELLULAR COMPONENTS TRANSITORY CELLS ORIGIN: pluripotent cells in bone marrow – Macrophages – Plasma cells – Mast cells – Neutrophils – Eosinophils © Copyright Universidad Europea. Todos los derechos reservados