noun, singular: kidney calyx
The kidney calices are of two forms: major calices and minor calices. The minor calices are funnel-shaped structures, each surroundingrenal papilla(e). Minor calices converge to form major calices that open to the renal pelvis. Thus, the urine drains from the papillary ducts (of renal papillae) to the minor calices, next to the major calices, and then to the renal pelvis.