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STRATIFIED SQUAMOUS EPITHELIUM

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The number of layers in this type of epithelium varies considerably in different locations but the shape and arrangement of the cells are quite characteristic. The deepest or basal layer which rests on a basement membrane is formed by low columnar or cuboidal cells which steadily divide mitotically to provide a constant supply of cells for the overlying layers. Next to the basal layer are present a few layers of larger polygonal cells. Stratified Squamous Epithelium   As the free surface is approached the cells gradually become flattened and at the surface they assume a squamous 'flat' shape. The condition of the cells of the most superficial layers of the stratified squamous epithelium varies with the location and environment of the epithelium. Two subvarieties of the stratified squamous epithelium are recognized:     Kratinized (also called cornified)                      Nonkeratinized (also called nonc...
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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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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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