transitional epithelium

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 [ep″ĭ-the´le-um] (pl. epithe´lia) (Gr.)
the cellular covering of internal and external surfaces of the body, including the lining of vessels and other small cavities. It consists of cells joined by small amounts of cementing substances. Epithelium is classified into types on the basis of the number of layers deep and the shape of the superficial cells.
ciliated epithelium epithelium bearing vibratile, hairlike processes (cilia) on its free surface.
columnar epithelium epithelium whose cells are of much greater height than width.
cuboidal epithelium epithelium whose cells are of approximately the same height and width, and appear square in transverse section.
germinal epithelium thickened peritoneal epithelium covering the gonad from earliest development; formerly thought to give rise to germ cells.
glandular epithelium that composed of secreting cells.
pigmentary epithelium (pigmented epithelium) that made of cells containing granules of pigment.
sense epithelium (sensory epithelium) neuroepithelium (def. 1).
simple epithelium that composed of a single layer of cells.
squamous epithelium that composed of flattened platelike cells.
stratified epithelium epithelium made up of cells arranged in layers.
transitional epithelium a type characteristically found lining hollow organs, such as the urinary bladder, that are subject to great mechanical change due to contraction and distention; originally thought to represent a transition between stratified squamous and columnar epithelium.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

tran·si·tion·al ep·i·the·li·um

highly discernible stratified epithelium with large, polyploid superficial cells that are dome shaped when relaxed but broad and flattened when distended; occurs in the calyces of the kidney, and in the ureter and bladder.
Farlex Partner Medical Dictionary © Farlex 2012

tran·si·tion·al ep·i·the·li·um

(tran-zish'ŭn-ăl ep'i-thē'lē-ŭm)
A highly distensible pseudostratified epithelium with large polyploid superficial cells that are cuboidal in the relaxed state but broad and squamous in the distended state; occurs in the kidney, ureter, and bladder.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
References in periodicals archive ?
The urinary bladder was composed of a proper lamina with fold-shaped transitional epithelium and not modeled dense connective tissue with a presence of blood vessels.
The nuclear sizes of the bladder transitional epithelium are of about 5 [micro]m for the normal cells (I type of the models) and 10 [micro]m for the enlarged (II, V types of the models, Table 1), which is larger than the wavelengths of the visible range 490-750 nm.
Considering that, in the transitional epithelium, the most highly induced cells were in direct contact with urine (Figure 3), the induction of CYP1A1 in bladder presumably was caused by contaminants excreted into the urine.
The presence of a squamous epithelium in or near the skin and a transitional epithelium in the blind deeper part of the sinus with surrounding smooth muscle reinforces this theory (2).
Sections studied from TURBT specimen, shows native bladder tissue lined focally by transitional epithelium showing stratification.
The proximal one-third of the female urethra is lined by transitional epithelium, the distal two-thirds by stratified squamous epithelium.
Histogenesis of cloacogenic carcinoma: fine structure of anal transitional epithelium and cloacogenic carcinoma.
Additionally, eosinophilic intracytoplasmic inclusion bodies were present in colonic and gastric epithelia and in transitional epithelium of the kidney.
Histopathological examination shows papillary growth with multilayer and hyperplastic transitional epithelium infiltrating to surrounding stroma.
Severe atypia of transitional epithelium and carcinoma of the urinary bladder.

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