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Topic: Transitional epithelium

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	NTP: Abstract for TR-416 - o-Nitroanisole (Site not responding. Last check: 2007-11-06)
		Focal hyperplasia of the transitional epithelium of the urinary bladder was present in one female rat that received 222 ppm and two male rats and six female rats that received 2,000 ppm.
		Hyperplasia of the transitional epithelium of the urinary bladder was present in nearly all exposed male and female rats examined at the interim evaluations.
		The incidence of hyperplasia of the transitional epithelium of the kidney pelvis was significantly increased in exposed male and female rats and transitional cell papillomas were present in three males and one female that received 18,000 ppm.
	ntp-server.niehs.nih.gov /index.cfm?objectid=0709A42B-D232-74D3-055A884C4D0A929B (2015 words)

	Transitional Epithelium (Site not responding. Last check: 2007-11-06)
		Transitional epithelium is a form of stratified epithelium characteristic of the bladder and ureter.
		When the bladder is empty the epithelium has many layers and the surface cells are cuboidal with a dome-shaped surface.
		When full, the bladder epithelium is stretched, the number of cell layers reduced, and the superficial cells are squamous.
	astro.temple.edu /~sodicm/labs/EpithWeb/tsld027.htm (78 words)

	Pathology
		The mucosa of the renal pelvis, ureter and urinary bladder is lined by stratified epithelium, the urothelium or transitional epithelium (from the erroneous concept that this epithelium constitutes a transition between stratified squamous and columnar epithelia).
		The epithelium is 2-3 cells thick in the pelvis, up to 5 in the ureter and up to 7 cells thick in the bladder in the undistended state.
		Transitional epithelium is a stratified epithelium characterized by the fact that the most apical cells are the roundest and largest in diameter.
	www.med-ed.virginia.edu /courses/path/urinary/uroth1.cfm (624 words)

	TRANSITIONAL EPITHELIUM
		Transitional epithelium contains cells that are flattened and cells that are cuboidal; hence the name "transitional".
		Another way to remember transitional epithelium is that the cells have the capacity to stretch and flatten so the calyx and bladder can expand.
		Note that in the bladder transitional epithelium (shown below) the cells nearest the apex are rounded.
	cellbio.utmb.edu /microanatomy/epithelia/transitional_epithelium.htm (114 words)

	Epithelium Lab (Site not responding. Last check: 2007-11-06)
		Note the differences in thickness of the epithelium on the two specimens and that on both the epithelium is covered by a layer of cellular material (keratin).
		Transitional epithelium is the specialized epithelium associated with urinary structures.
		Again you will note differences in thickness of the epithelium on the two specimens, this epithelium however is not covered by a cellular material as was seen in the examples of stratified squamous epithelium.
	courses.smsu.edu /emh420f/unit_1/Epithelium_lab.htm (1225 words)

	Case of the Month July 2002 (Site not responding. Last check: 2007-11-06)
		Transitional cell carcinoma of the right and left ovary with metastases to the omentum, serosa of the small intestine, serosa/adventitia and wall of rectosigmoid colon, posterior pelvic peritoneum, posterior cervical region and lateral portions of uterus, and spleen.
		On the other hand, some experts claim that transitional cell carcinoma of the ovary is a variant of serous carcinoma with pseudopapillary pattern, although the current view favors that transitional cell carcinoma of the ovary is a separate entity.
		Immunohistochemical and pathological studies appear to favor that transitional cell carcinoma of ovary is one subtype of ovarian surface epithelial carcinomas, originating in celomic epithelium (as proposed by Austin and Norris 1987), and is different from urothelial carcinoma of urinary bladder.
	www.hsc.wvu.edu /som/pathology/pathcases/apcases2003/apcasejan03/apcasejan03discussion.htm (741 words)

	The Ureter (Site not responding. Last check: 2007-11-06)
		The epithelium is the same from the minor calyces to the exit from the bladder.
		Transitional epithelium appears to be multilayered although each cell does have contact with the basement membrane.
		The epithelium is able to cope with distention by the arrangement of cells and by recruitment of the folds.
	www.med.mun.ca /anatomyts/renal/auret4.htm (166 words)

	Epithelium (Site not responding. Last check: 2007-11-06)
		Transitional epithelium is a form of stratified epithelium lining the urinary bladder and part of the urinary tract.
		Transitional epithelium can be recognized by the large rounded epithelial cells lining the lumen (in contrast to other stratified epithelia, where such surface cells are squamous).
		Goblet cells are found scattered in the heterogeneous epithelium of mucous membranes, for example, in the pseudostratified epithelium of the respiratory tract or in the absorptive epithelium of the small and large intestine.
	www.technion.ac.il /~mdcourse/274203/lect2.html (2682 words)

	Transitional Epithelium from the lining of the Ureter (Site not responding. Last check: 2007-11-06)
		This layer of transitional epithelium is about 7 cell layers deep and appears "cuboidal".
		The loose fibrous connective tissue under the basement membrane of the transitional epithelium.
		Transitional epithelium is limited to the lining of the "collecting" portions of the urinary system, from the minor calyxes in the renal medulla, to the "neck" of the bladder.
	www.dmacc.cc.ia.us /instructors/transiti.htm (84 words)

	Cloacal Papillomas in Psittacine Birds: A Retrospective Histopathologic Review (Site not responding. Last check: 2007-11-06)
		Transitional epithelium was defined as stratified epithelium with areas of adjacent squamous and columnar morphology, with neither predominating in the papilloma.
		The mean mitotic index for papillomas with transitional epithelium was 5.2, with a range of zero to sixteen.
		The presence of squamous and transitional epithelium in the majority of cases reflects clinical observations that cloacal papillomas commonly arise at or near the mucocutaneous junction adjacent to the vent.
	www.vet.uga.edu /IVCVM/1998/Stedman/Stedman.htm (1656 words)

	Pathology
		Benign transitional epithelial tumors are uncommon in the bladder.
		There is normal surface transitional epithelium from which solid broad sheets of epithelium with cystic change grow downwards into an edematous stroma.
		Histologically, the lesion is characterized by numerous small tubules lined by cuboidal epithelium surrounded by thick basement membrane lying in edematous and congested lamina propria.
	www.med-ed.virginia.edu /courses/path/urinary/uroth3.cfm (540 words)

	EPITHELIA
		The epithelium facing the lumen of the esophagus is an example of a stratified squamous epithelium.
		An epithelium always rests on a basal lamina, and this basal lamina is the interface between the epithelium and underlying connective tissue.
		The thicker, multilayered epithelium which faces the lumen of the bladder is called a transitional epithelium.
	medocs.ucdavis.edu /CHA/402/labsyl/01/02.htm (2408 words)

	Transitional epithelium (Site not responding. Last check: 2007-11-06)
		The layer of tissue just underneath the epithelium is connective tissue, and at the bottom of the image you can see some smooth muscle tissue.
		The bar indicates the thickness of the transitional epithelium.
		Transitional epithelium is a stratified tissue in which the cells are all have a fairly round shape when the organ it lines is not distended (stretched out).
	www.austin.cc.tx.us /histologyhelp/tissues/th_trans_e.html (149 words)

	Virtual Hospital: Atlas of Microscopic Anatomy: Section 1 - Cells (Site not responding. Last check: 2007-11-06)
		The term transitional epithelium does not imply that this epithelium is in actual transition from one type to another, but rather refers to the appearance of the cells, which changes as the organs with which they are associated are stretched or relaxed.
		Transitional epithelium (uroepithellum): This stratified epithelium is found lining the urinary tract from the renal calyces to the urethra.
		It is in direct continuity with the simple epithelium of the ducts and collecting tubules of the kidney and the stratified squamous epithelium of the urethra.
	www.vh.org /adult/provider/anatomy/MicroscopicAnatomy/Section02/Plate0224.html (219 words)

	Blue Histology - Epithelia and Glands
		Simple cuboidal epithelium occurs in small excretory ducts of many glands, the follicles of the thyroid gland, the tubules of the kidney and on the surface of the ovaries.
		Transitional epithelium is found exclusively in the excretory urinary passages (the renal calyces and pelvis, the ureter, the urinary bladder, and part of the urethra).
		The shape of the cells in the surface layer of a transitional epithelium varies with the degree of distension of the organs whose lumen is lined by this type of epithelium.
	www.lab.anhb.uwa.edu.au /mb140/CorePages/Epithelia/Epithel.htm (4083 words)

	Tumor - Wikipedia, the free encyclopedia
		squamous epithelium: squamous cell papilloma, squamous cell carcinoma
		transitional epithelium: transitional cell papilloma, transitional cell carcinoma
		tubules epithelium (kidney): renal tubular adenoma, renal cell carcinoma (Grawitz tumor)
	en.wikipedia.org /wiki/Tumor (430 words)

	Male Reproductive 5 The Duct System
		The genital ducts are tubular organs in which the lamina epithelialis varies from the stratified epithelium in the testes to a transitional epithelium in the urethra.
		Both portions are lined with transitional epithelium, both contain erectile tissue, and both contain (species variable) branched tubular mucous glands, the urethral glands.
		This epithelium changes from transitional in the pelvic and penile urethra to stratified squamous epithelium at or before the opening of the urethra.
	www.cvm.okstate.edu /instruction/mm_curr/histology/mr/himrp5.htm (524 words)

	Bladder Cancer - Types of Cancer
		More than 90% of bladder cancers are derived from the transitional epithelium and are thus called transitional cell carcinoma(TCC).
		Carcinoma in situ, or CIS, is the presence of cancerous-appearing cells, proliferating in an abnormally high number, but are confined to the transitional epithelium.
		Between the transitional cell layer and the muscle fibers is a layer of connective tissue and cells known as the lamina propria.
	www.cornellurology.com /cornell/bladder/gi/types.shtml (864 words)

	transitional (Site not responding. Last check: 2007-11-06)
		This is an example of transitional epithelium from the urinary bladder.
		The arrows are on the actual transitional cell layer.
		Below the dark layer of transitional cell nuclei is the subucosa.
	cal.vet.upenn.edu /histo/epithelium/transitional.html (31 words)

	EPITHELIUM
		Pseudostratified epithelium is found primarily in the respiratory system and is often referred to as "Respiratory Epithelium".
		Transitional epithelium - This epithelium lines the expandable tubes and organs of the body - e.g.
		Stratified squamous keratinizing epithelium - This epithelium has the same morphology as stratified squamous non-keratinized, but with the outer layer undergoing a metamorphosis to tough non-living layer of keratin.
	lifesci.rutgers.edu /~babiarz/epithe.htm (764 words)

	stratepi (Site not responding. Last check: 2007-11-06)
		Keratinized stratified squamous epithelium is identified by the multiple layers of dead cells at the surface.
		In contrast to the keratinized stratified squamous epithelium, flattened surface cells of a mucous type are nucleated and living.
		Transitional epithelium is a stratified type that can be confused with stratified squamous.
	www.mhhe.com /biosci/ap/histology_mh/stratepi.html (362 words)

	Lab Exercises- Calyx, Ureter, Bladder
		The epithelium of the minor and major calyces is transitional, beginning with 2-3 layers and ending with 8 or more layers.
		Some areas still have only a simple columnar epithelium, others have the mixture of types of epithelia typical of transitional epithelium.
		Underneath the epithelium is a layer of connective tissue.
	cellbio.utmb.edu /microanatomy/kidney/bladder_lab.htm (475 words)

	Urinary Bladder (Site not responding. Last check: 2007-11-06)
		Some authorities do not include a submucosa in the wall of the urinary bladder--in their opinions, all of the connective tissue (ct) between the mucosa and the muscularis is part of the lamina propria of the mucosa.
		To the left of the epithelium is the connective tissue (ct) that includes both the lamina propria of the mucosa and the submucosa.
		To the left of the epithelium is connective tissue comprising the lamina propria of the mucosa and the submucosa.
	www.austin.cc.tx.us /histologyhelp/organs/ox_urin_bladder.html (253 words)

	[No title]
		where the epithelium is. First examine the cells covering the tips of the villi at low power.
		In general, a pseudostratified epithelium appears stratified because the nuclei are on
		Transitional epithelium is capable of marked distention, and is restricted to areas of the
	www.urmc.rochester.edu /smded/Histology/Manuals/Epithelium.html (1126 words)

	2. Epithelium
		The epithelium that lines the gut is considered to be simple columnar regardless of the presence of lymphocytes and of the fact that some goblet cell nuclei may not line up perfectly with those of the enterocytes.
		This epithelium is pseudostratified columnar with cilia and mucus cells.
		Fortunately, transitional epithelium is a specific type of epithelium instead of a general category.
	neuromedia.neurobio.ucla.edu /campbell/epithelium/wp.htm (4377 words)

	[No title]
		[3-10]:Bladder, H & E- Transitional epithelium is found lining the walls of hollow organs which are subject to great distention and contraction such as the ureter and bladder.
		The epithelium may consist of 2-3 cell layers when distended and up to 10 cell layers when contracted.
		Large “dome” cells on the surface are often binucleated, a characteristic of transitional epithelium.
	www.georgetown.edu /dml/educ/hist/lab3/lab3.txt (673 words)

	Epithelia and Tissue Lab
		Identification is difficult because of the highly folded nature of the epithelium and the highly cellular lamina propria that underlies it.
		Goblet cells are everywhere in the epithelium interspersed among the ciliated cells.
		Note the flattened appearance of the stratified squamous epithelium near the surface and contrast it later with transitional epithelium.
	www.fsu.edu /~histo/two~1.htm (2932 words)

	Bladder Cancer - What is Cancer?
		As discussed above, the bladder wall has several tissue layers- the transitional epithelium, the muscular layer, and the fat layer-each separated from one another by fibrous bands known as connective tissue.
		In bladder cancer, the most common cell type to become a cancer is the transitional epithelial cell, designated as transitional cell carcinoma or TCC.
		For example, cells that compose a low grade TCC may appear very similarly to surrounding normal transitional epithelium, except that the cancer transitional cells invade.
	www.cornellurology.com /cornell/bladder/gi/cancer.shtml (400 words)

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