EpitheliaLab - Epithelia Epithelium is one of the 4 primary...

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Epithelia Epithelium is one of the 4 primary tissues of the body. It consists of cells usually arranged in sheets or tubules that are attached to the underlying basement membrane. The basement membrane, a structure seen with the light microscope, has been subdivided into a basal lamina (thought to be produced by the epithelium) and a reticular lamina (produced by connective tissue cells). You will usually see the basal lamina only with the electron microscope. Epithelium is found covering the numerous internal and external surfaces of the body and may also be modified to form glandular structures. IN the health care field, it is very important to be able to recognize and identify the various types of epithelia since they are important in organ identification and essential in the detection of pathological processes. In general, the various types of epithelia are classified according to the shape of the cells and whether or not they are layered. In a simple epithelium the cells form a single layer and are all attached to the basement membrane. A stratified epithelium consists of multiple layers of cells in which only the basal layer is attached to the basement membrane. A simple epithelium which appears to be stratified is classified as "pseudostratified" (the nuclei are in different layers, but all the cells are in contact with basement membrane). A stratified epithelium in which the number of cell layers varies upon physiological stretching is called "transitional". Epithelial cells are classified by shape into squamous (flat), cuboidal and columnar varieties. The name of a stratified epithelium is determined from the shape of the apical layer of cells. Simple squamous and simple cuboidal epithelia . Kidney . You should be able to identify both types of simple epithelia on this slide. You should also be able to distinguish between the nuclei and cytoplasm of the cells.
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Endothelium and mesothelium The epithelium which lines the pleural, pericardial, and peritoneal cavities is derived from mesoderm. It is termed mesothelium because of its origin from mesoderm. Scan through the list of slides and try to locate some mesothelial cells (hint: try the ileum or jejunum). Simple squamous epithelia lining blood vessels are called
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EpitheliaLab - Epithelia Epithelium is one of the 4 primary...

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