Editing Urinary incontinence (section)

===Children===
[[File:Voiding dysfunction.svg|thumb|upright=1.6|Voiding dysfunction]]
{{main|Enuresis}}
Urination, or voiding, is a complex activity. The bladder is a balloon-like muscle that lies in the lowest part of the abdomen. The bladder stores urine and then releases it through the urethra, which is the canal that carries urine to the outside of the body. Controlling this activity involves nerves, muscles, the spinal cord and the brain.{{citation needed|date=April 2021}}

The bladder is made of two types of muscles: the detrusor and the sphincter. The detrusor is a muscular sac that stores urine and squeezes to empty. Connected to the bottom or next of the bladder, the sphincter is a circular group of muscles that automatically stays contracted to hold the urine in. It will automatically relax when the detrusor contracts to let the urine into the urethra. A third group of muscles below the bladder (pelvic floor muscles) can contract to keep urine back.{{citation needed|date=April 2021}}

A baby's bladder fills to a set point, then automatically contracts and empties. As the child gets older, the nervous system develops. The child's brain begins to get messages from the filling bladder and begins to send messages to the bladder to keep it from automatically emptying until the child decides it is the time and place to void.{{citation needed|date=June 2022}}

Failures in this control mechanism result in incontinence. Reasons for this failure range from the simple to the complex.{{citation needed|date=June 2022}}