Renal pelvis

The renal pelvis is a funnel-shaped sac formed by the union of the major calices. The renal pelvis ends at the ureteropelvic junction.

The renal calyces and pelvis form the upper expanded end of the excretory duct of the kidney: the urine formed in the kidney passes through a renal papilla at the apex into the minor calyx; two or three minor calyces converge to form a major calyx, through which urine passes before continuing through the renal pelvis into the ureter.