The renal calyx is one of the components of the normal human kidney. The renal calyx is a vessel consisting of renal pyramids, which are the structural unit of the kidney. The renal vessel has two lateral branches that divide it into segments (in humans this division does not usually exist). Each pyramid is renal tissue centered around the germinal tubule. The renal calyx segment connects the vasa recta and capillaries with the glomeruli located along its upper end, as well as all the vasa recta and capillaries with the arterial system of the kidney through two flat openings or slits located in its middle segment, while the openings, called primary, are located in front them.
The renal calyces are large, or c. R. majore can be found in four places along the bud axis, i.e. between certain segments of the .R. there is a small one between the second sector .r. polygonal and the third sector, the latter is located between the apex of the triangle formed by the lower segments on the cross section of R. minor.
As for the urethra, the renal walls contain a small number of grooved structures (urethral canal), which are blood capillaries. Lymphatic vessels disappear within the transition zone and penetrate into the spiral parts. which may affect the secretion of lymph or interstitial fluid; the first circulates within the renal papilla, connecting the lymphatic capillaries of the interlobular pelvis and carrying out the drainages of many lymphatic vessels found in such formations of the renal pyramid.