Epithelial Tissue

In our class we took photos to demonstrate what different types of epithelial tissues there are. I put them in a slideshow above to show our examples. Here are each definition of each of them:

• Simple Squamous: Single layer of flattened cells with disc-shaped nuclei and sparse cytoplasm which provide a slick, friction-reducing lining in lymphatic and cardiovascular systems.
• Found in the kidney glomeruli, lining of heart, blood vessels, lymphatic vessels, and serosae.
• Simple Cubiodal: Single layer of cube-like cells with large, spherical central nuclei which creates secretion and absorption.
• Found in kidney tubules, ducts and secretory portions of small glands, and ovary surface.
• Simple Columnar: Single layer of tall cells with oval nuclei; many contain cilia. It is used for secretion and absorption but the cilia helps move substances through internal passageways.
• Non-ciliated type line small bronchi, uterine tubes, and some regions of the uterus.
• Pseudo-stratified Columnar: Single layer of cells with different heights; some do not reach the free surface. Used for secretion and propulsion of mucus.
• Found in the male sperm-carrying ducts (non-ciliated) and trachea (ciliated).
• Stratified Squamous: Thick membrane composed of several layers of cells which is used for protection of underlying areas subjected to abrasion.
• Forms the external part of the skin's epidermis (keratinized cells), and linings of the esophagus, mouth, and vagina (non-keratiniezed cells).
• Stratified Cuboidal: Typically two cell layers thick and quite rare in the body.
• Found in some sweat and mammary glands.
• Stratified Columnar: Occurs at transition areas between two other types of epithelia with a limited distribution of the body.
• Found in the pharynx, male urethra, and lining some glandular ducts.
• Transitional: Several cell layers, basal cells are cuboidal, surface cells are dome shaped. Stretches to permit the distension of the urinary bladder.
• Lines the urinary bladder, ureters, and part of the urethra.