The spleen is the largest lymph gland in the human body. It is located below the ribs and above the stomach. It is soft and dark in color. It is called blood reservoir or blood bank. It consists of two types of spleen marrow. Red marrow and white marrow. It can store 300 ml of blood. Spleen measures 13×7×3 cubic cm and weighs 150 grams. The spleen acts as the main filter of blood. As most red blood cells are destroyed in the spleen, it is called the red blood cell graveyard. It destroys germs and prevents diseases.