what is the structure of the ureter
In human anatomy, the ureters are tubes made of smooth muscle fibers that propel urine from the kidneys to the urinary bladder. In the adult, the ureters are usually 25â30 cm (10â12 in) long and ~3â4 mm in diameter.n human anatomy, the ureters are tubes made of smooth muscle fibers that propel urine from the kidneys to the urinary bladder. In the adult, the ureters are usually 25â30 cm (10â12 in) long and ~3â4 mm in diameter.