324Lecture3 epithelial

324Lecture3 epithelial - Epithelial Tissues Epithelium...

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Epithelial Tissues
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Epithelium always has a free surface, regardless of location. (ex. synovial joints MPL cell and fibroblast lining). covers surfaces, lines all body cavities, forms all glands, forms large organs such as the liver and kidneys.
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Functions 1. Protective - lines and covers (skin and mesothelium). 2. Secretion and absorption - digestive tract and glands. Cells contact other tissues only basally Epithelium has complex embryological origins derived from all three germ layers. ectoderm - surface of body (epidermis) mesoderm - body cavity lining (mesothelium), blood vessel lining (endothelium). endoderm - digestive tract lining, lungs, liver.
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Cells predominate, most cellular tissue. Cells well organized, strongly attached to each other (tight junctions). Minimal intercellular matrix. Basal surface faces internally, rests on basement membrane or lamina. Avascular, diffusion feeds metabolic needs.
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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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324Lecture3 epithelial - Epithelial Tissues Epithelium...

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