![]() This makes the upper boundary of the trigone. Between the two ureteric openings is a raised area of tissue called the interureteric crest. These ureteric openings have mucosal flaps in front of them that act as valves in preventing the backflow of urine into the ureters, known as vesicoureteral reflux. The two ureters enter the bladder at ureteric orifices, and the urethra enters at the trigone of the bladder. In males the neck of the urinary bladder is next to the prostate gland. The neck of the bladder is the area at the base of the trigone that surrounds the internal urethral orifice that leads to the urethra. The peritoneum is carried by it from the apex on to the abdominal wall to form the middle umbilical fold. The apex (also called the vertex) is directed forward toward the upper part of the pubic symphysis, and from there the median umbilical ligament continues upward on the back of the anterior abdominal wall to the umbilicus. In gross anatomy, the bladder can be divided into a broad fundus, a body, an apex, and a neck. In humans, the bladder is a hollow muscular organ situated at the base of the pelvis. Male and female urinary bladders in lateral cross-section ![]()
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