Trigone of urinary bladder

Trigone of urinary bladder

Urinary bladder

The interior of bladder.
Latin	trigonum vesicae urinariae
Gray's	subject #255 1231
Dorlands/Elsevier	t_19/12823635

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

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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.

Pathology

Clinically important because infections tend to persist in this region.

Additional images

v • d • e Anatomy: urinary system
Abdomen	Kidneys • Ureters • Orifice of ureter
Pelvis	Urinary bladder (Uvula, Trigone, Detrusor, Apex, Neck) Urethral sphincters (External sphincter muscle of male urethra, External sphincter muscle of female urethra, Internal sphincter muscle of urethra) Urethra
Development	Development of the urinary and reproductive organs