324Lecture4 epithelial

324Lecture4 epithelial - Epithelia Part Two Epithelium...

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Epithelia Part Two
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Epithelium
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Pseudostratified Columnar Epithelium Crowded columnar; 2 cell shapes with nuclei in different positions (levels), gives false stratified appearance all cells touch basement membrane Three predictable features: a) goblet cells b) 2 nuclei layers c) cilia Tissue prevents stabilizing mucous Common in ventilatory and reproductive ducts. Non-ciliated in large gland excretory ducts. Functions in providing moist atmosphere without stabilizing secretions.
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Stratified Squamous Epithelium Cells not all squamous shaped - basal cells are cuboidal, become flattened as they move to the surface. Covers the body surface and openings. True stratified tissue; only basal layer (cuboidal cells) touches the basement membrane. Since surface cells are squamous, = Squamous epithelium. All cells tightly adherent - ground substance and desmosomes hold cells together. Basement membrane (loose CT) anchors tissue.
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This note was uploaded on 01/04/2012 for the course BIO 324 taught by Professor Crawford during the Spring '09 term at Western Kentucky University.

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324Lecture4 epithelial - Epithelia Part Two Epithelium...

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