Calyx

The minor calyx, in the kidney, surrounds the apex of the renal pyramids. Urine formed in the kidney passes through a papilla at the apex into the minor calyx then into the major calyx. Two or three minor calyces converge to form a major calyx. A major calyx, in the kidney, surrounds the apex of the renal pyramids. Urine formed in the kidney passes through a renal papilla at the apex into a minor calyx then into a major calyx before passing through the renal pelvis into the ureter. Peristalsis of the smooth muscle originating in pace-maker cells originating in the walls of the calyces propels urine through the renal pelvis and ureters to the bladder.

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