This jewel beetle has been dissected to show the various components of its anatomy. The head, or front segment, contains the mouth, eyes, and antennae. The first segment of the thorax, located just behind the head, bears the first pair of legs. The large posterior section of the body, including the second and third segments of the thorax and the abdomen, contains the remainder of the walking legs and all the vital body organs. The wings lack muscles and are manipulated by muscles located inside the abdomen. The outer surface of the body, called the exoskeleton, is protected by a hard chitinous material.