Bladder sphincter - Definition

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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.