We also have the proximal convolute, as well as the distal convolute. Now, inside the medulla, we have the D standing and the ascending loop of Henley. We also have the collecting duct and we have a second capillary bed system known as the vasa rectan. So the vasaecta is basically this entire bed of capillaries. And we'll discuss what the function of that is in just a moment. So let's discuss what the renal pelvis is.