On the other side we have the renal capsule, the renal cortex, the renal medulla, our renal pelvis, the renal pyramids, which are these brown sections here. And we have the nephron shown in purple. Now, this diagram only shows a single nephron, but actually we have over a million nephrons within this single kidney. And the nephron is the basic unit of structure of the kidney. And we'll discuss what the structure of the nephron is in just a moment. First, let's discuss the renal capsule, the renal cortex and the renal medulla.