The urinary bladder is an organ that serves to collect urine to be voided through urination after the urine is filtered through the kidneys (where the necessary ions are reabsorbed if physiologically needed through feedback mechanisms found throughout the body and
The urinary bladder is an organ that serves to collect urine to be voided through urination after the urine is filtered through the kidneys (where the necessary ions are reabsorbed if physiologically needed through feedback mechanisms found throughout the body and in the nephrons of the kidneys, such as the macula densa).
Histologically, the urinary bladder is lined with transitional epithelium and does not produce mucus.
Generally, the bladder is a hollow, muscular, and pear-shaped distensible elastic organ that sits on the pelvic floor. It receives urine via the ureters, which are thick tubes running from each kidney down to the superior part of the bladder.
Urine is collected in the body of the bladder, and finally it is voided through the urethra. The fundus is the base of the bladder, which is formed by the posterior wall and contains the trigone of the bladder, and is lymphatically drained by the external iliac lymph nodes. The trigone is the structure that contains the outlet (urethra) of the bladder.
While the general volume of the human bladder will vary from person to person, the range of urine that can be held in the bladder is roughly 400 mL (~13.5 oz) to 1000 mL (~34 oz), with the average capacity being 400 to 600 mL.
One mnemonic often heard in clinical settings related to the bladder is: “water (ureters) under the bridge.” This phrase describes an anatomical relati