Triangle of U

An anatomical region of the female pelvis

Triangle of U

Diagram of the Triangle of U

The Triangle of U is an anatomical region of the female pelvis that is of particular interest in urogynecology. It is defined by the anatomical landmarks of the urethra, the ureteral orifices, and the urinary bladder. This region is crucial for understanding various urological and gynecological conditions.

Anatomy

The Triangle of U is located at the base of the urinary bladder and is bordered by the following structures:

• The apex of the triangle is formed by the internal urethral orifice, where the urethra begins.
• The two lateral angles are formed by the ureteral orifices, where the ureters enter the bladder.

The area within the Triangle of U is smooth and lacks the rugae that are present in other parts of the bladder, which allows for a more consistent surface for the passage of urine.

Clinical significance

The Triangle of U is clinically significant for several reasons:

• It is a common site for the development of urinary tract infections (UTIs) due to its proximity to the urethra and the potential for bacterial colonization.
• The region is also important in the context of stress urinary incontinence and other forms of urinary incontinence, as the support structures of the bladder neck and urethra are located nearby.
• Surgical procedures such as cystoscopy often focus on this area to assess the health of the bladder and the ureteral orifices.

Pathology

Conditions affecting the Triangle of U include:

• Cystitis, an inflammation of the bladder, often involves this region.
• Vesicoureteral reflux, a condition where urine flows backward from the bladder into the ureters, can be associated with abnormalities in the Triangle of U.
• Bladder cancer may also involve this area, necessitating careful examination during diagnostic procedures.

Related pages

• Urinary bladder
• Urethra
• Ureter
• Urogynecology