Kidney
the secreting organs of the urine, two in number, situated in the lumbar region on each side of the spine, which they approach on their upper extremities. The kidney is from four to five inches long, about two and a half broad, somewhat more than one in thickness, and from three to five ounces in weight. Covered by a layer of fat, they rest on the diaphragm, the right, on account of the liver, being somewhat lower than the left. The anterior surfaces are convex, the posterior flat.