Kegel8 Glossary - Medical terms without the jargon
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Detrusor Muscle

The smooth muscle in the wall of the bladder that contracts the bladder and expels urine.

Bladder showing the detrusor muscle of the bladder

The detrusor muscles smooth fibres are arranged in spiral, longitudinal, and circular bundles. When the bladder is stretched (full), this signals the parasympathetic nervous system to contract the detrusor muscle. This encourages the bladder to expel urine through the urethra.

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To pass urine both the internal sphincter and the external sphincter must be opened simultaneously, problems with these muscles can lead to stress, urge, mixed urinary incontinence or overflow incontinence.

A healthy bladder usually holds between 300-350 ml of urine. As the urine increases the wall of the bladder thins as it stretches, allowing it to store more urine without increasing internal pressure.

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