The renal medulla is basically this entire section here that consists of these renal pyramids. And the renal pyramids exist as a result of the stacking of these nephrons. They basically are stacked adjacent to one another along the entire section of the medulla as well as the cortex, and they form these renal pyramids. So the real medulla is the inner portion of the kidney and it basically contains several important structures of the nephron, just like the cortex does. The medulla contains a structure known as the Loop of Henley. It also contains the vase orcta, which is a bed of capillaries, as we'll see in just a moment.