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TRANSITIONAL EPITHELIUM

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More than one cell layers  Number of cells layers change able depend on orgen  The structure of the transitional epithelium is best studied in sections of the wall of the urinary bladder. It is to be noted that the microscopic structure of this special type of multilaminar epithelium varies greatly according to the state of distension of the urinary bladder. Undistended (contracted) Transitional epi: Transtional (contracted)    In the undistended (i.e, contracted) urinary bladder, the urothelium appears to consist of 6 or more layers of cells. The basal layer of the epithelium consists of cuboidal cells. Over the basal layer are present several layers of polygonal cells. The most superficial layer of the epithelium appears to consist of very large dome-shaped cells also called umbrella cells whose highly convex apices bulge into the bladder cavity. Some of the umbrella cells contain two nuclei. Distension (stretched) Transtional epi: Transtional (...
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SIMPLE COLUMNAR EPITHELIUM

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Simple Columnar Epithelium This type of epithelium consists of a single layer of columnar (column-shaped cells). On surface view the cells appear as a mosaic resembling that of simple cuboidal epithelium but the outline of the cells is rather smaller. In pendicular sections the columnar shape of the cells becomes evident in which it is seen that the height of each cell is much greater than its width. The nucleus is commonly oval in shape and usually located near the base of the cell. The nuclei of all the cells of a sheet of simple columnar epithelium are often seen to be situated at roughly at the same level. Simple columnar epithelium is widely distributed in the body. Simple Columnar Epithelium   It lines (for example) :  the internal surface of  Stomach  Intestines  Gallbladder  Uterus  In many locations in the body  The cells of the simple columnar epithelium show modifications on their apical surface, which includes m...
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STRATIFIED CUBOIDAL EPITHELIUM

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The stratified cuboidal epithelium consists of two or three layers of cuboidal cells. This type of epithelium has a very restricted distribution in the human body. It only occurs as the lining of the larger ducts of some exocrine glands like pancreas and salivary glands. The ducts of the sweat glands are also lined by this type epithelium. The stratified cuboidal epithelium has not been found to be involved in absorptive or secretory activity. Its probable function is to provide the ducts with a stronger lining than the simple cuboidal or simple columnar epithelium. Stratified Cuboidal Epithelium Found In: Follicular Antrum Ducts of sweat glands
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