Picture of Spleen
The spleen is an approximately 5-inch by 3-inch organ that is located in the upper left abdominal area. It is located just behind the stomach and under the diaphragm.
The spleen has many roles; it filters the blood and removes old, abnormal, and damaged red blood cells. It also stores platelets and white blood cells. Using these cells, the spleen helps the body fight off infections.
Text Reference: The Complete Spleen: Structure, Function, and Clinical Disorders, 2nd edition: "The Structure and Function of the Spleen"