Picture of Bladder
The bladder is a hollow, muscular organ that is located in the pelvis behind the pubic bone. It stretches to accommodate the volume of urine produced by the kidneys. Urine is stored in the bladder until it is ready to be expelled from the body. The kidneys produce urine, and it travels down to the bladder via two tubes called ureters. The muscles of the bladder are under voluntary control. Urine leaves the bladder through a tube called the urethra, which leads to the outside of the body. The urethra in males is much longer than it is in females.
Text Reference: "Urinary Bladder." National Cancer Institute.