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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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 proximal one-third of the female urethra is lined by transitional epithelium, the distal two-thirds by stratified squamous epithelium.
1-3] These lesions are most commonly found within the prostatic urethra, where they have been attributed to hyperplasia or evagination of the underlying prostatic ductal epithelium[1,3,4] or a metaplastic conversion of the overlying transitional epithelium.

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