What are the different poles in kidney?

The kidney has two main poles: the renal hilum and the renal pelvis. The renal hilum is the entry and exit point for blood vessels, nerves, and the ureter, located on the concave side of the kidney. The renal pelvis, situated at the medial aspect, collects urine from the kidney's calyces before it moves into the ureter. Additionally, the kidney has an upper (superior) pole and a lower (inferior) pole, which refer to the anatomical ends of the kidney's elongated shape.