uretrës

The ureters are a pair of muscular tubes that carry urine from the kidneys to the bladder. Each ureter is approximately 25-30 centimeters long and is composed of three layers: the innermost layer, the mucosa, which is lined with transitional epithelium; the middle layer, the muscularis, which is composed of smooth muscle; and the outermost layer, the adventitia, which is connective tissue. The ureters are retroperitoneal, meaning they are located behind the peritoneum, and they pass through the pelvic cavity to enter the bladder. The ureters are connected to the kidneys via the renal pelvis, and they are connected to the bladder via the ureteral orifices. The ureters play a crucial role in the urinary system, as they transport urine from the kidneys to the bladder for storage and eventual elimination from the body.