transitional epithelium


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transitional epithelium

[tran′zish·ən·əl ‚ep·ə′thē·lē·əm]
(histology)
A form of stratified epithelium found in the urinary bladder; cells vary between squamous, when the tissue is stretched, and columnar, when not stretched.
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Consistent SVA IHC staining occurred at the transitional epithelium of the renal pelvis and the urinary bladder (Figure 1, panel D) of 4 piglets; within epithelial cells of the choroid plexus of the cerebrum (8 piglets) and the tongue (5 piglets); and at the ependymal cells of the choroid plexus, vascular endothelium, and the enterocytes of the villi of the small intestine (2 piglets) (Table 2, http://wwwnc.cdc.gov/EID/article/22/7/15-1583-T2.htm).
whose mucosa was composed of fold- shaped transitional epithelium which lines the inside of the organ and dense modeled connective tissue with elastic fibers.
As the cells of the transitional epithelium are densely packed, we considered the refractive index of the surrounding medium for the cell (the extracellular matrix) in the first layers to be minimally different from the cellular one and to be lower than the refractive index of the cytoplasm because of the presence of extracellular composition between the cells, so that [n.sub.med] = 1.365.
Mitotic activity can be easily distinguished Z5 Transitional epithelium Z6 Collagen fibers Loose connective tissue with a rich vascular supply.
(23) In animal studies, a deficiency in zinc was noted to affect the morphology of epithelial cells in the urinary tract, resulting in an increased thickness in the transitional epithelium cells.
Within 72 hours, the epithelial layer will double to look like transitional epithelium. Organization and differentiation of cells begin after 96 hours; transitional epithelium is transformed into a layer of low cuboidal cells, which then differentiate into ciliated and goblet cells.
(1995) who examined human urinary bladder by scanning electron microscopy, and indicated that collagen in the superficial portion provides support and protection for the transitional epithelium against over-distention and in the middle and deep portions it supports and protects blood vessels and nerves against external forces.
In bladder, CYP1A1 was highly expressed in both endothelium (Table 3, Figure 2B) and transitional epithelium forming the bladder mucosa (Table 2, Figure 3).
Ten specimens contained smooth muscle lying beneath stratified squamous or transitional epithelium, suggesting that it was from the internal anal sphincter.
The small round cells (SRCs) most probably originated from the tubular epithelium of the kidney or the transitional epithelium of the urinary tract.

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