PATHOLOGY

Detailed explanation-1: -Internally, the kidney has three regions-an outer cortex, a medulla in the middle, and the renal pelvis in the region called the hilum of the kidney. The hilum is the concave part of the bean-shape where blood vessels and nerves enter and exit the kidney; it is also the point of exit for the ureters.

Detailed explanation-2: -The structures that enter and exit the renal hilum are-Ureters, renal arteries, and renal veins.

Detailed explanation-3: -Blood vessels, lymphatics, and nerves enter and exit the kidney at the renal hilum, which contains the renal sinus, a fat-filled space occupied by renal calyces.