Summary of Filed Health Plans & Rate Levels as of 10/31/14. The Health Insurance Reform Information Center is a forum for information on the recent national health insurance reform and its effects on Illinois. The Department will post fact sheets, legislation, and other useful material as it becomes available. Please check back routinely for updates.
The internal structure of the kidney is divided into two main areas... a light outer area called the renal cortex, and a darker inner area called the renal medulla. Within the medulla there are eight (8) or more cone-shaped sections known as renal pyramids.
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.