tissues-outline - Tissues page 1 of 6 ANAT 11110 Fall 2011...

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Tissues page 1 of 6 ANAT 11110 Lectures 11, 12, & 13 Fall 2011 The Tissue Level of Organization I. Epithelium A. General characteristics 1. Widespread throughout the body, covering most body surfaces, inside and out 2. Always has a free surface, underside of which is anchored to connective tissue via a 'basement membrane' 3. Epithelial tissues, generally, lack a direct blood supply; usually nourished indirectly from blood supply in underlying connective tissue 4. Capable of replacement by cell mitosis 5. Cells usually tightly packed, with little intercellular material 6. Function in absorption, secretion, and/or protection; usually highly innervated B. Membranous epithelium: classified by shape, arrangement, and function 1. Simple squamous epithelium a. Single layer of thin, flattened cells b. Found where substances need to move easily across a membrane (e.g., air sacs of lungs, walls of capillaries, Bowman’s capsule of the kidneys, surface membrane layer lining internal body cavities) 2. Simple cuboidal epithelium a. Single layer of cube-shaped cells b. Found lining small ducts/tubules that may have excretory, secretory, or absorptive functions (e.g., surface of the ovaries, lining of smaller salivary gland ducts and sweat gland ducts, portions of kidney tubules)
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Tissues page 2 of 6 3. Simple columnar epithelium a. Single layer of elongated cells, with the cell nucleus usually located deep in the cell, near the basement membrane b. Found in the linings of uterine tubes and various organs of the digestive tract (i.e., stomach, intestines, gall bladder), collecting ducts of kidneys c. May be equipped with microvilli on free surface to increase absorptive properties, plus goblet cells, which secrete mucus onto free surface; or, with goblet cells and cilia on free surface to move fluids or particles along a passageway 4. Pseudostratified columnar epithelium a. Single layer of columnar epithelium in which cell nucleus is located at
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This note was uploaded on 01/03/2012 for the course ANAT 11110 taught by Professor Manley-buser during the Fall '11 term at Palmer Chiropractic.

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tissues-outline - Tissues page 1 of 6 ANAT 11110 Fall 2011...

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