In the anatomy of mammals, the urinary bladder is the organ that collects urine excreted by the kidneys prior to disposal by urination. Urine enters the bladder via the ureters and exits via the urethra.

Anatomy

The urinary bladder is a hollow, muscular and distensible organ that sits on the pelvic floor (superior to the prostate in males). On its anterior border lies the pubic symphysis and, on its posterior border, the vagina (in females) and rectum (in males). The urinary bladder is normally capable of storing 1.1-1.3 liters of urine, but because it is made up of transitional epithelium it is able to stretch to volumes of even several litres.

The ureters enter the bladder diagonally from its dorsolateral floor in an area called the trigone. The trigone is a triangular shaped area on the postero-inferior wall of the bladder. The urethra exits at the lowest point of the triangle of the trigone

Detrusor muscle

The detrusor muscle is a layer of the urinary bladder

Diseases of the bladder

• bladder sphincter dyssynergia, a condition where the sufferer cannot coordinate relaxation of the urethra sphincter with the contraction of the bladder muscles
• cystitis
• cystolithiasis
• cancer of the urinary bladder: bladder cancer
• hematuria, or presence of blood in the urine, is a reason to seek medical attention without delay, as it is a symptom of bladder cancer as well as bladder and kidney stones.
• interstitial cystitis
• ureterocele
• urinary bladder dysfunction
• urinary incontinence

Pledren Harnblase Vejiga urinaria Vessie שלפוחית השתן Šlapimo pūslė Urineblaas 膀胱 Bexiga Мочевой пузырь Močový mechúr Virtsarakko Urinblåsa 膀胱