ANATOMY

Detailed explanation-1: -Two of the openings are from the ureters and form the base of the trigone . Small flaps of mucosa cover these openings and act as valves that allow urine to enter the bladder but prevent it from backing up from the bladder into the ureters. The third opening, at the apex of the trigone, is the opening into the urethra.

Detailed explanation-2: -Answer and Explanation: The area of the urinary bladder bounded by the openings of the two ureters and the urethra is called the trigone. Trigone is a triangle-shaped region at the base of the bladder formed by the opening of the ureters and the internal urethral orifice.

Detailed explanation-3: -These areas are: the ureteropelvic junction (UPJ), the ureterovesical junction (UVJ), and the crossover of the common iliac arteries. The UPJ is where the pelvis of the kidney transitions into the ureter and the UVJ is where the ureters enter the bladder.

Detailed explanation-4: -The fundus of the bladder contains three openings which form the trigone of the bladder; the internal urethral orifice and the two ureteric orifices.

Detailed explanation-5: -Two ureters. These narrow tubes carry urine from the kidneys to the bladder. Muscles in the ureter walls continually tighten and relax forcing urine downward, away from the kidneys.