Wednesday, October 10, 2012

Epithelial Tissu

Stratified Cuboidal and Columnar, Stratified cuboidal is rare in the body, found in some sweat and mammary glands , usually two cell layers thick. Stratified columnar limited distribution in the body, is found in the pharynx, male urethra, and lining some glandular ducts, and occurs at transition areas between two other types of epithelia 
Stratified Squamous, Its a thick membrane composed of several layers of cells. Function in protection of underlying areas subjected to abrasion. forms the external part of the skin's epidermis, and lining of the esophagus mouth, and vagina. 



Simple Columnar, its a single layer of tall cells with oval nuclei, many contain cilia. You can usually find goblet cells in this layer. Function in absorption and secretion. Non ciliated type line digestive tract and gallbladder. Ciliated type line small bronchi, uterine tubes, and some regions of the uterus. cilia help move substances throughout internal passageway. 

Simple Cuboidal, single layer of cube like cells with large, spherical central nuclei. The function in secretion and absorption. Present in the kidney tubules, ducts and secretory portions of small glands, and ovary surface. 


Transitional, Has several cell layers, basal cells are cuboidal, surface cells are dome shaped, Stretches to permit the dissension of the urinary bladder,  Lines the urinary bladder, ureters, and part of the urethra.  
Simple Squamous, single layer of flattened cells with disc-shaped central nuclei and sparse cytoplasm.  The functions, diffusion and filtration. Present in the kidney glomeruli, lining of heart, blood vessels, lymphatic vessels, and serosae. 
Pseudo-statified Columnar,  single layer of cells with different heights; some do not reach the free surfaces, The nuclei are seen in different layers, Function in secretion and propulsion of mucus, It is present in male sperm- carrying ducts and trachea. 

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