Illustration of coronal plane views of the kidneys. On the left the kidney medulla shows seven renal pyramids separated by renal columns with blood vessels. Urine collected from the pyramids passes into minor then major renal calyces in continuity with the large renal pelvis (blue-grey). This leads to the ureter, which carries the urine to the bladder. Many of the kidney glomeruli are found in the outer renal cortex. Renal vessels are shown supplying and draining the kidney. On the right, the calyces are opened to show their association with the apices of the pyramids. From Lizars, J. 1823 A system of anatomical plates of the human body. W.H. Lizars, Edinburgh.