4 epithelium2007mod_nxpowerlite_

4 epithelium2007mod_nxpowerlite_ - Epithelium (the first of...

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Epithelium (the first of four) Medical Cell and Tissue Biology (BMS 6110C) Ross and Pawlina, 5 th Dr. Kelly Selman Rm D2-32 392-4476 [email protected] August 28, 2007
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Tissues Consist of cells and extracellular components that are organized to perform specific functions Have specific morphological (structural) and functional characteristics Four basic types of tissues Epithelium Connective tissue Muscle Nerve Structure reflects function
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Epithelium Connective tissue Epithelium & connective tissue
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Nerve CT Skeletal muscle Epithelium CT Smooth muscle Epithelium, connective tissue, muscle & nerve
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Epithelium Where found? - All internal and external surfaces covered by sheets of epithelial cells -Glands (both ducts and secretory portions) Embryological derivation: -All three germ layers Functions: Protection Absorption Transport Secretion Gas Exchange Sensory **Structure reflects function** Free surface
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Free surface Cells in close apposition & form sheets of cells Cells rest on a basement membrane (basal lamina) Cells face a free surface Cells are adhesive Intercellular junctions Tissue is avascular Characteristics of an epithelium
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Epithelia are polarized sheets of cells Sheets of cells have a free surface and a basal surface (at basement membrane) Cells themselves are also polarized Each cell has apical, basal and lateral surfaces Surface modifications of cells at each of those surfaces reflect functions at those surfaces Characteristics of an epithelium *Structure reflects function* Free surface
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Pancreatic acinus Epithelial cells have 2 different functional domains (compartments) - Apical domain - Baso-lateral domain Apical domain Baso- lateral domain BM Lumen L JC
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Maintenance of apical and basolateral domains requires tight junctions Extracellular compartment with blood vessels Pancreatic acinus
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Organelles are polarized within cells Pancreatic acinar cell Characteristics of an epithelium
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Based on morphology of cells and NOT on functional characteristics Shape of apical cells Squamous Cuboidal Columnar Arrangement of cells Simple
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This note was uploaded on 01/04/2012 for the course ANT 610C taught by Professor Johnaris during the Spring '10 term at University of Florida.

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4 epithelium2007mod_nxpowerlite_ - Epithelium (the first of...

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