Isotopes when written out are common nouns, and should begin with the uncapitalized element name, followed by a hyphen (not an em dash or en dash) and then the mass number. Examples are carbon-14 and uranium-235.
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. The periphery of the renal pelvis is interrupted by cuplike projections called calyces.
Each kidney is reddish-brown, bean shaped organ and is about 4 inches long and 2 inches wide. It has a medial concave surface and a lateral convex surface. On the medial concave border of each kidney, there is a vertical slit called hilum, which is bounded by thick lips of the renal substance.Inside the kidney, the hilum extends into a large cavity called renal sinus.All structures that enter or exit the kidney pass through the hilum. From front backwards, these structures are: 1  Renal vein. 2  Two branches of renal artery. 3  Ureter. 4  Third branch of renal artery. 5  Lymph vessels.nside the kidney, the hilum extends into a large cavity called renal sinus. All structures that enter or exit the kidney pass through the hilum. From front backwards, these structures are: 1  Renal vein. 2  Two branches of renal artery. 3  Ureter.