part_of starts_at ends_at bladder-urethra transition zone epithelium of bladder-urethra transition zone EMAPA:36333 The epithelium of bladder-urethra transition zone (TS:22-TS:28) is the zone or region of the epithelium located where the bladder neck meets the urethra/pelvic urethra, marking the junction where these two different epithelia meet (urothelium of bladder and epithelium of pelvic urethra). It is similar to transitional zones in other organs, such as the female cervix and the Z-line in the oesophagus. It is located close to where the nephric duct attaches to the urogenital sinus. Part of the bladder-urethra transition zone and part of the urogenital sinus and part of the urinary system. Use this term to annotate expression in the epithelium where the bladder neck meets the pelvic urethra, when the tissue cannot be identified as being either part of the bladder or part of the pelvic urethra. anatomical_structure TS22 TS28