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urinary bladderOverview

Click on images for full-size photographs

thumbnail bladder h&e 4x thumbnail bladder h&e 10x
thumbnail bladder h&e 20x thumbnail bladder h&e 40x

The urinary bladder receives the ureter at the dorsal wall of its neck, a posterior narrowing of the bladder continuous with the urethra. The wall of the urinary bladder is formed by, from inside to outside, urinary epithelium (transitional epithelium or urothelium) with large superficial cells that may be binuclear and polyploidy; a fibrous, vascular lamina propria that sometimes contains nonpathologic aggregations of lymphocytes; a wide inner circular and outer longitudinal muscularis of smooth muscle; and an adventitia of fibroelastic tissue.

The micrographs illustrate the structure of the urinary bladder wall. The 4X micrograph shows how the mucosa is folded in an empty urinary bladder. The 10X micrograph exhibits the inner circular and outer longitudinal muscularis, or muscularis interna and muscularis externa. The 20X and 40X micrographs show details of the urinary epithelium, the lamina propria, and the muscularis interna. The 40X micrograph displays the large superficial cells of the urinary epithelium and the smooth muscle muscle cells of the muscularis interna.

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