Urinary Incontinence in Children »
How does the urinary system work?
Urination, or voiding, is a complex
activity. The bladder is a balloon-like organ that lies in the lowest part of
the abdomen. The bladder stores urine, then releases it through the urethra, the
canal that carries urine to the outside of the body. Controlling this activity
involves nerves, muscles, the spinal cord, and the brain.
The bladder is composed of two types of muscles: the detrusor, a muscular sac
that stores urine and squeezes to empty; and the sphincter, a circular group of
muscles at the bottom or neck of the bladder that automatically stay contracted
to hold the urine in and 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.
A baby's bladder fills to a set point, then automatically contracts and
empties. As the child gets older, the nervous system matures. ...
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