The urinary bladder is a muscular sack, when empty it is the size of a pear. The bladder is situated in the pelvis, found just above and behind the pubic bone.
Made in the kidneys, urine makes it’s way down two tubes called ureters to the bladder itself. The bladder then stores this urine, allowing urination to be voluntary as well as infrequent for the body. Layers of muscle tissue lining the bladder stretch as it reaches full capacity, holding around 400 ml to 600 ml at full capacity.
During urination, the muscles lining the bladder contract and two sphincters open to allow the release of urine through the urethra. The length of the urethra for men is around 8 inches due to the penis and for women it is 1.5 inches.
The bladder can suffer from various conditions due to your diet, hydration levels, as well as old age.