<Tr> <Td> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> </Td> </Tr> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> <P> Transitional epithelium is a type of stratified epithelium--tissue consisting of multiple layers of epithelial cells which can contract and expand as needed . It is so named because of this function in the transition of degree of distension . This tissue structure type is found in urothelium, including that of the renal pelvis, urinary bladder, the ureters, the superior urethra, and the prostatic and ejaculatory ducts of the prostate . </P> <P> The appearance of transitional epithelium depends on the layers in which it resides . Cells of the basal layer are cuboidal, or cube - shaped, and columnar, or column - shaped, while the cells of the superficial layer vary in appearance depending on the degree of distension . These cells appear to be cuboidal with a domed apex when the organ or the tube in which they reside is not stretched . When the organ or tube is stretched (e.g. when the bladder is filled with urine), the tissue compresses and the cells become stretched . When this happens, the cells flatten, and they appear to be squamous and irregular . </P>

What kind of epithelium lines the urinary bladder