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Histology Part II: Connective Tissue

Histology Part II: Connective Tissue. MMHS Anatomy. Location and Description. Location : Found throughout the body but never exposed to the external environment. Description : Made up of specialized cells. Contains extracellular protein fibers called “matrix”.

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Histology Part II: Connective Tissue

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  1. HistologyPart II: Connective Tissue MMHS Anatomy

  2. Location and Description Location: • Found throughout the body but never exposed to the external environment. Description: • Made up of specialized cells. • Contains extracellular protein fibers called “matrix”. • “Ground Substance” fluid found throughout. • May or May not be highly vascularized. • Bone, Blood, Loose Connective, Adipose = Vascular • Cartilage, Dense Connective = Poorly vascularized

  3. Functions of Connective Tissue • Provides a structural framework of the body. • Transports Fluids • Binds together other body tissues. • Protection of vital internal organs. • Stores long-term energy.

  4. Classification of Connective Tissue

  5. Loose Connective • Contains a disorganized “packing material” that fills spaces between organs and cushions and supports epithelia. Adipose tissue: looks like droplets of lipids: functions to pad and insulate the body. • Nuclei are squished to the side.

  6. Dense Connective • Collagen fibers dominated this tissue. • Fibers are tightly packed and run parallel to each other. • Fibers often have “wavy” appearance. Examples: tendons, ligaments, and elastic tissue.

  7. Blood Red blood cells (erythrocytes) = the most numerous and biconcave-shaped cells. Transport gases. • White blood cells (leukocytes)= fewer in number; large, irregularly-shaped, fight diseases. • Plasma = made up of a watery fluid. • Platelets (thrombocytes)= fragments of cells that clot blood.

  8. Hyaline Cartilage • Most common type of cartilage • Collagen fibers are so closely packed and so appear to be absent.. • Locations: Connections between ribs, coverings of elbow and knee.

  9. Compact Bone • Made up of collagen fibers and calcium salts. • Lacunae (compartments within bone) contain osteocytes. • Bone tissue is highly vascularized = diffusion of gases occurs between osteocytes through canaliculi.

  10. Spongy “Cancellous” Bone • Made up of bone columns called trabeculae. • Lacunae contain osteocytes. • Spongy Bone tissue contains red marrow. • Found in the ends of long bones called epiphyses. • Cushions impact during falls and distributes force to the compact bone. • Contains many air spaces in the tissue.

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