Ureteral orifice

Trigone of urinary bladder

The trigone is a smooth triangular region of the internal urinary bladder formed by the two ureteral orifices and the internal urethral orifice.

The area is very sensitive to expansion and once stretched to a certain degree, the urinary bladder signals the brain of its need to empty. The signals become stronger as the bladder continues to fill.


Clinically important because infections (trigonitis) tend to persist in this region.

Additional images

See also

External links

  • - "The Male Pelvis: The Urinary Bladder"

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