Bladder sphincters are circular muscles that control the urination process. There are two of these sphincters: one internal, located in the bladder neck, and one external that is voluntarily controlled and prevents urine from leaking out. When there is a large quantity of urine in the bladder, pressure is exerted on the bladder neck sphincter
, which relaxes. Urine then flows towards the voluntary sphincter, made up of striated muscle fibers, which the patient contracts to stop urine from escaping. When there is a condition affecting these sphincters, urinary incontinence can occur, and these cases are defined as sphincter deficiency
Original article published by
. Translated by Jeff
Latest update on November 12, 2013 at 04:28 AM by Jeff.