“The spleen is a large organ in the lymphatic system working with the thymus, lymph and bone marrow. It is located in the left upper quadrant of the abdominal cavity, just below the diaphragm, behind the fundus of the stomach. It weighs between 5-7 ounces. It is vulnerable to being injured by fractures of the 9th, 10th and 11th ribs, and it is one of the few organs whose metabolic rate isn’t controlled by the thyroid.”