The unrinary bladder is a pyramid shaped muscular organ that rests on the pelvic floor; immediatley posterior to the symphisis pubis. It functions as a temporary resevoir for the storage of urine. In normal adults and it takes approximatley 250 ml of urine to accumulate, before the urge to urinate is triggered. The baldder does have the potential for storing approximatley 750 ml. When empty the bladder had 4 surfaces (superior,posterior, and 2 inferolateral) and 4 angles (anterior,inferior, and 2 posterolateral).