MICROANATOMY

Detailed explanation-1: -The central region of the kidney contains the renal pelvis, which is located in the renal sinus, and is continuous with the ureter. The renal pelvis is a large cavity that collects the urine as it is produced.

Detailed explanation-2: -As the ureter enters the kidney it enlarges into a cavity, the renal pelvis; urine passes into this pelvis from the collecting tubules. Nephrons are numerous (20, 000 in a mouse).

Detailed explanation-3: -Pelvic ureter The ureter enters the pelvis, where it crosses anteriorly to the iliac vessels, which usually occurs at the bifurcation of the common iliac artery into the internal and external iliac arteries. Here, the ureters are within 5 cm of one another before they diverge laterally.

Detailed explanation-4: -The kidneys usually sit located over the medial aspect of the psoas muscle and the lateral aspect of the quadratus lumborum. The proximal ureters will typically pass over the psoas muscle on their way to the bony pelvis.