LABORATORY.pdf - Introduction to Histology • A tissue is a...

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Introduction to Histology• A tissue is a group of cells, in closeproximity, organized to perform one ormore specific functions.Basic Tissue Types1.Epithelial tissuecreates protectiveboundaries and is involved in thediffusion of ions and molecules.2.Connective tissueunderlies andsupports other tissue types.3.Muscle tissuecontracts to initiatemovement in the body.4.Nervous tissuetransmits andintegrates information through thecentral and peripheral nervous systemEpithelial Tissue• Epithelial tissue is a highly cellulartissue that overlies body surfaces, linescavities, and forms glands.• Epithelial cells are numerous, exist inclose apposition to each otherCell Surfaces• The cells of epithelial tissue have threetypes of surfaces differentiated by theirlocation and functional specializations:basal, apical, and lateral.Tissue Structure• Two major characteristics of epithelialtissue divide it into subclasses: the shapeof the cells and the presence of layers.Shape of Cells• Squamous–cells are flattened, can bekeratinized or nonkeratinized, involved inprotection and diffusion, found incapillary walls and skin• Cuboidal–cells are cube shaped, can befound forming tubes in the nephrons ofthekidney involved in secretion andabsorption• Columnar–cells are rectangular, ciliaare often present, involved in absorption,secretion, protection, and lubrication,form the inner lining of the gut tubeLayers• Simple–one layer of cells• Stratified –two or more layers of cellsSpecialized Epithelial TissueTransitional epitheliumdistendstissues of urinary tractKeratinized stratified squamousepitheliummakes up the epidermis ofskinNon-keratinized stratifiedsquamous epitheliumfound in regionssubject to abrasion, for example oral

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Term
Spring
Professor
jane smith
Tags
Connective Tissue Classification, specialized connective tissue

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