Kidneys lie retroperitoneally on either side of verterbralcolumn against posterior abdominal wall.
These ducts are formed from the confluence of several collecting ducts, and they empty into a renal calyx. Final urine enters a Duct of Bellini and empties into a minor calyx. Minor calyx to major calyx to renalpelvis to ureter to bladder. Walls of calyces, pelvis, and ureter contain smooth muscle which contracts and propels urine in peristaltic spurts. A collapsible bag located behind the symphysis pubis.