Английская Википедия:Facet cell

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Facet cells (also known as umbrella cells,[1] capping cells, superficial urotheliocytes) are a type of cells located in the renal pelvis, the ureters,and the urethra. Umbrella cells form the outermost layer of the urothelium, which is a special type of epithelium found in the renal pelvis, the ureters, and the urethra. Umbrella cells are special in that they can contain multiple nuclei. Their apical membrane contains numerous invaginations, which allows the cells to stretch during urination. Umbrella cells are linked together with tight junctions which:

Umbrella cells contain uroplakin ia, uroplakin ib, uroplakin ii, and uroplakin iii.[3] These increase the strength of the urothelium.[3]

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