The document describes the anatomy and locations of the kidneys, ureters, and urinary bladder. It discusses that the kidneys are retroperitoneal bean-shaped organs located in the posterior abdominal cavity between vertebrae T12 and L3. The ureters are tubular structures that carry urine from the kidneys to the bladder. The urinary bladder is a muscular organ in the pelvis that temporarily stores urine until urination. Imaging modalities like CT, MRI, ultrasound can be used to visualize these...