Your bladder is a balloon-shaped organ that sits in the pelvis, expanding to hold urine and contracting to release urine. It is supported by pelvic floor muscles that hold the bladder in place. The urethra is the tube that carries urine from the bladder out of your body. Sphincter muscles keep the urethra closed and hold the urine in your bladder until the brain sends your body the signal that it’s “time to go.”
When these pelvic floor muscles are strong, the urethra is supported and no leakage of urine occurs. However, when these sphincter muscles are weak, the urethra is not supported and urine is allowed to leak.
Pictured: your urinary system