These are the many layers of the ants abdomen. This area contains the heart and most of the digestive system. The segmented layers are made of a material called chitin which serves as a kind of body armor..	An ant's head, just like any other human being, contains its brains. The hooked parts on the head are called mandibles.They are jaws that crush the food into tiny easily digestible pieces.	The thorax is the chest of the ant.The thorax is divided into three segmented areas. There are muscles in the thorax that make the legs move.