Bladder Control

The body stores urine in the bladder. During urination, muscles in the bladder contract or tighten. This forces urine out of the bladder and into a tube called the urethra that carries urine out of the body. At the same time, muscles surrounding the urethra relax and let the urine pass through. Spinal nerves control how these muscles move. Incontinence occurs if the bladder muscles contract or the muscles surrounding the urethra relax without warning.