Kidney

===The kidney is each of the organs that is located in the abdominal cavity of mammals, birds, and reptiles. It excretes urine. It consist of the Cortex, Medulla, Renal Artery, and the Renal Vein. The cortex is a tissue forming the outer layer of an organ, or the structure in a plant or an animal. Medulla is the inner region of an organ or a tissue. It is the soft internal tissue or the pith of a plant. The Renal Artery is an artery that originated from the abdominal aorta, and it supplies the kidneys, adrenal glands, and the uterus. The Renal Arteries arise of the side of the abdominal aorta, right under the superior mesenteric artery, then it supplies the kidney with blood. They are directed across the crus of the diaphragm, kind of like they are forming a right angle with the aorta. Finally, the Renal Vein is a vein that accompanies the renal arteries. It opens into the vena cava at the second lumber vertebra.===