Epithelial Tissue

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Epithelial Tissue is a tissue that forms a covering. Ex: Skin On one side of the tissue, there is a “free surface” like air or fluid. It is connected to the underlying tissue by a basement membrane that is difficult to pass through. Epithelial tissue is nonvascular, it has no blood vessels.
Squamous Squamous- Flat, like cheek cells Cuboidal- a cube, like salivary glands Columnar- a column shape, like fallopian tubes

There are two different arrangements of epithelial tissue cells.

1.) Simple- a single layer of cells that allows air to pass through

2.) Stratified- more than one layer of cells

Examples:
Simple Columnar
 This arrangement forms the lining of the stomach and intestines. The nuclei are located near the basement membrane.
Simple Cuboidal
 The cells make several layers and are cube-shaped, elongated, and irregular. This arrangement forms the lining of the trachea and bronchi. It also lines the kidney tubules and ducts of salivary glands.
Simple Sqamous
 The cells are arranged into a single, flat layer. This form of epithelium forms walls of capillaries and the air sacs of the lungs.
Pseudostratified Columnar
 Cilia commonly lines and moves mucus out of the airway. The nuclei are located at different levels within the cells.
Stratified Squamous
 The younger cells are cuboidal, while the older cells are flattened. This forms the lining of the oral cavity, anal canal, and vagina.
Transitional
 Transitional Epithelium forms the inner lining of the urinary bladder.