Trigone

Trigone is a triangular area, located at the base of the bladder, in the human body. It is an important part of the urinary system and plays a crucial role in the process of urination. The trigone is defined by three points: the two ureteric orifices and the internal urethral orifice.

Anatomy

The trigone is a smooth triangular region of the internal urinary bladder formed by the two ureteric 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.

Function

The main function of the trigone is to act as a funnel that directs the urine into the urethra from the bladder. It also helps prevent reflux of urine from the bladder back into the ureters.

Clinical significance

Infections of the urinary tract may affect the trigone. This can lead to conditions such as cystitis, which is inflammation of the bladder. The trigone can also be involved in various other medical conditions, such as bladder cancer.

See also

• Urinary system
• Bladder
• Ureter
• Urethra