GENERAL HISTOLOGY

Detailed explanation-1: -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. From the major calyces, the urine flows into the renal pelvis; and from there, it flows into the ureter.

Detailed explanation-2: -Urine passes from the renal pyramids into the renal pelvis. This funnel-shaped structure occupies the central cavity of each kidney and then narrows as it extends out to join the ureter. Urine drains from the renal pelvis into the ureter.

Detailed explanation-3: -The tips of the renal pyramids form papillae where the terminal portions of the kidney’s tubular system (collecting ducts of Bellini) empty urine into a cup-shaped calyx of the ureter.

Detailed explanation-4: -The renal medulla contains the vasa recta, the loop of Henle, and the medullary portion of the collecting duct. The renal medulla has a pyramidal structure, with the collecting ducts emptying into the renal calyces (Fig.