Spleen

The spleen lies between the stomach and the diaphragm in the upper left hand side of the abdominal cavity. It is flat, oblong gland (with a tongue-like appearance) that sits on top of the digestive organs in the abdominal cavity. The spleen is involved in the circulatory system in that it destroys, recycles and synthesizes red blood cells. The spleen also stores excess blood that can be released into the bloodstream in response to an injury such as a large cut.