MICROANATOMY

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: -The urethra is also known as the urinary opening. Hence the opening of urinary bladder is urethra.

Detailed explanation-3: -What Are the Ureter and Urethra? The ureter is a small tube, or duct, that connects the bladder and kidneys. Urine passes through the ureter from the kidneys to the bladder. The urethra is the tubular path that connects the bladder to the body’s exterior, allowing urine to exit the body.