epithelial

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Author:
Karatinah
ID:
33634
Filename:
epithelial
Updated:
2010-09-09 10:18:45
Tags:
epithelial
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Description:
epithelial
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  1. Simple Cuboidal
    • one layer of deep, square (box- or cube- like) cells
    • found: surface of ovaries, ducts of some glands
  2. Simple squamous
    1 layer of flat, scale-like cells; have central nuclei;adapted for diffusion and filtrationfound: inside lungs, blood vessels, capillaries; lens of eye; eardrum
  3. Simple columnar
    • one layer of long, tall cells (like a fence); nuclei of neighboring cells are usually found at same height along bottom of cells;
    • May have extensions of the membrane called microvilli (brush border);
    • May have goblet cells which produce mucus;
    • May have cilia on outside of membrane to propel particles (and mucus) along surface of the cells
    • found: lining the digestive tract – with microvilli from stomach to anus;
  4. Ciliated columnar epithelium
    found in portions of the upper respiratory tract, and the uterus
  5. STRATIFIED COLUMNAR
    EPITHELIUM--SALIVARY GLAND DUCTS
  6. STRATIFIED COLUMNAR
    • Notice how the bottom layer
    • (Red Line), looks cuboidal in nature
    • but the because the top layer is columnar,
    • and it is the top layer which determines the classification, this is called stratified columnar.
    • Green line - Top layer
    • Red Line - Bottom layer
  7. Pseudostratified columnar
    • cells appear to be stratified but are not;
    • nuclei are at different levels and some cells do not reach the surface.
    • found: Eustachian tubes (internal auditory tubes) and in the upper respiratory tract; nonciliated found in male urethra

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