![]() The kidney is bean-shaped with a superior and an inferior pole, anterior and posterior surfaces, and lateral and medial borders. The midportion of the kidney is often called the midpole. In adults, the normal kidney is 10-14 cm long in males and 9-13 cm long in females, 3-5 cm wide, 3 cm in antero-posterior thickness and weighs 150-260 g. The left kidney is usually slightly larger than the right. ![]() The long axis of the kidney is parallel to the lateral border of the psoas muscle and it lies anterior to the quadratus lumborum muscle. Being parallel to the psoas muscle, the kidneys lie at an oblique angle, with its superior pole more medial and posterior than its inferior pole. Due to the right lobe of the liver, the right kidney usually lies slightly lower than the left kidney 16. The kidneys are located to either side of the vertebral column in the perirenal space of the retroperitoneum, within the posterior abdominal wall. ![]()
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