<prompt> Which of the following is called the Merciers bar in bladder?Mucosa between two ureteric orificesMucosa between uvula vesicae and ureteric orificeMucosa between verumontanum and ureteric orificeMucosa between internal and external urethral orifice  <response>: The Merciers bar interureteric bar interureteric ridge is a curved fold of mucous membrane between the two ureteric orifices inside the bladder. This fold of mucous membrane is formed by the thicknening of the superior border of the trigone muscle. In cystoscopy, the intraureteric ridge appears as a pale band and acts as a guide to the ureteric orifices. The mucosal fold running from the uvula vesicae to the ureteric orifice office is called the Bells Bar This fold forms the lateral borders of the trigone and contains a band of muscle fibers called the Bells Muscle. Ref: Grays Anatomy 41st edition Pgno: 87 