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Epithelial tissue
 

Epithelial tissue

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    Epithelial tissue Epithelial tissue Presentation Transcript

    • Epithelial Tissue (pg 2)
    • Tissue = collection of cells that have similar structure and function together as a unit
    • Tissue = collection of cells that have similar structure and function together as a unit Histology = Study of tissues
    • Epithelial Tissues • Form the covering of all body surfaces, line body cavities and organs, and form glands
    • Epithelial Tissues • Form the covering of all body surfaces, line body cavities and organs, and form glands • Cells are tightly packed
    • Epithelial Tissues • Form the covering of all body surfaces, line body cavities and organs, and form glands • Cells are tightly packed • One free surface
    • Epithelial Tissues • Form the covering of all body surfaces, line body cavities and organs, and form glands • Tightly packed • One free surface • Avascular (no blood vessels)
    • Epithelial Tissues • Form the covering of all body surfaces, line body cavities and organs, and form glands • Tightly packed • One free surface • Avascular (no blood vessels) • Regenerate quickly
    • Shapes 1. Squamous = flat cells, thin nuclei
    • Shapes 1. Squamous = flat cells, thin nuclei 2. Cuboidal = cubelike cells, spherical central nuclei
    • Shapes 1. Squamous = flat cells, thin nuclei 2. Cuboidal = cubelike cells, spherical central nuclei 3. Columnar = Tall narrow cells, nuclei near bottom
    • Number of Layers 1. Simple = 1 layer
    • Number of Layers 1. Simple = 1 layer 2. Stratified = Multiple layers of cells. Named according to the type of cells at the free surface of the tissue
    • Number of Layers 1. Simple = 1 layer 2. Stratified = Multiple layers of cells. Named according to the type of cells at the free surface of the tissue 3. Pseudostratified = appears to be multiple layers, but is really only 1 layer
    • Glandular Epithelium • Exocrine glands = secrete products onto a surface via a duct
    • Glandular Epithelium • Exocrine glands = secrete products onto a surface via a duct • Can be unicellular (goblet cells) or multicellular
    • Exocrine Glands Classified according to STRUCTURE 1. Simple: duct has no branches 2. Compound: duct has branches
    • Exocrine Glands Classified according to STRUCTURE 1. Simple: duct has no branches 2. Compound: duct has branches 3. Tubular: gland has the same diameter as the duct 4. Acinar (Alveolar): gland is saclike
    • Exocrine Glands Classified according to SECRETIONS 1. Merocrine: fluid released by exocytosis Example: salivary and pancreatic glands
    • Exocrine Glands • Classified according to SECRETIONS 1. Merocrine: fluid released by exocytosis Example: salivary and pancreatic glands 2. Apocrine: small portion of cell is pinched off Example: Mammary glands
    • Exocrine Glands • Classified according to SECRETIONS 1. Merocrine: fluid released by exocytosis Example: salivary and pancreatic glands 2. Apocrine: small portion of cell is pinched off Example: Mammary glands 3. Holocrine: Cells fill with product and rupture Example: Sebaceous (oil) glands