bundles of smooth muscle fibers forming the muscular wall of the urinary bladder, which are arranged in a longitudinal and a circular layer and, on contraction, serve to expel urine[MP]. [ MP:0011774 http://en.wikipedia.org/wiki/Detrusor_urinae_muscle ]

Synonyms: muscularis propria of the urinary bladder urinary bladder detrusor muscle detrusor urinae muscle detrusor muscle urinary bladder detrussor smooth muscle detrusor musculus detrusor vesicae detrusor muscle of bladder detrusor smooth muscle

This is just here as a test because I lose it