True about the renal pelvis is all of the following except (AIIMS May 2010)
|A||Pelviureteric junction is the first constriction|
|B||It drains the renal medullary pyramids|
|C||It is related anteriorly to the renal vein and artery|
|D||It is related to the renal vein and artery posteriorly|
a. The renal collecting system includes the calyces, the renal pelvis, and the ureter .
b. There are usually 8 to 12 minor calyces that unite to form two to three major calyces, which in turn join to form the renal pelvis.
c. The renal pelvis tapers to form the ureter inferomedially.
d. The adult ureter is usually 25 to 30 cm in length.
e. The ureter is arbitrarily divided into segments for the purposes of surgical or radiographic demonstration.
f. The “abdominal” ureter extends from the renal pelvis to the iliac vessels, and the “pelvic” ureter extends from the iliac vessels to the bladder .
g. For radiographic purposes, the ureter is divided into three segments.
h. The upper, middle, and lower ureter are commonly described from the renal pelvis to the upper border of sacrum, from the upper border to the lower border of sacrum, and from the lower border of sacrum to the bladder, respectively.
i. There are three areas of relative narrowing in the ureter that are of clinical importance: the ureteropelvic junction, the point where the ureter crosses anterior to the iliac vessels, and the ureterovesical junction. For example, spontaneous passage of ureteral stones can be hampered at these areas of relative narrowing.
j. The ureters lie on the psoas muscle, pass medially to the sacroiliac joints, and cross the iliac vessels anteriorly.
k. In females, the uterine arteries are closely related to the lower ureters.
l. The blood supply to the calyces, pelvis, and upper ureter is derived from the renal arteries .
m. The lower ureter obtains its blood supply from the common and internal iliac, internal spermatic, and vesical arteries.