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The detrusor , levator ani, and external sphincter muscles share the sacral nerves as a common innervation source.
The most common abnormality was an incompletely emptying bladder, either because of obstructed outflow, an underactive detrusor , or urethral stricture.
During normal voiding the detrusor muscle contracts and the muscles of the urethral sphincter and pelvic floor relax in a co-ordinated fashion to allow the bladder to empty.
Pressure receptors in the bladder respond to the increased urine and contract the detrusor muscle , causing the internal sphincter to relax.
This is caused by the muscle of the bladder wall - known as the detrusor muscle - being overactive.
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