Urinary system, illustration 插畫檔

Illustration of the urinary system. The urinary system consists of four parts: the kidneys, ureters, bladder and urethra. The kidneys are located against the posterior abdominal wall, on either side of the spine, with the right kidney typically 1–2 cm lower than the left. The ureters arise from the renal pelvis at the renal hilum, descend and cross over the iliac vessels before entering the pelvic cavity, with their terminal ends opening obliquely into the bladder. The bladder, located in the anterior part of the pelvic cavity behind the pubic symphysis, temporarily stores urine and its base directly continues as the urethra