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- one layer of deep, square (box- or cube- like) cells
- found: surface of ovaries, ducts of some glands
1 layer of flat, scale-like cells; have central nuclei;adapted for diffusion and filtrationfound: inside lungs, blood vessels, capillaries; lens of eye; eardrum
- 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;
Ciliated columnar epithelium
found in portions of the upper respiratory tract, and the uterus
EPITHELIUM--SALIVARY GLAND DUCTS
- 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
- 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