MICROANATOMY

Detailed explanation-1: -The renal pelvis is a large cavity that collects the urine as it is produced. The periphery of the renal pelvis is interrupted by cuplike projections called calyces. A minor calyx surrounds the renal papillae of each pyramid and collects urine from that pyramid. Several minor calyces converge to form a major calyx.

Detailed explanation-2: -Urine forms in the nephrons and drains from collecting ducts in the papilla. The papilla fits into a cup-like structure called a calyx. The calyces form short branches that attach to a wide space called the renal pelvis.

Detailed explanation-3: -The calyces are normally cup shaped and are demonstrated in contrast radiography called excretory urogram or ascending pyelogram. The cupping of the calyces is obliterated and may reverse to become club shaped whenever there is an increased intrapelvic pressure in kidney as in hydronephrosis [1].