The sternum structure have three parts: manubrium, gladiolus and xiphoid process. The sternum is located in the center of the chest, and it connects to the ribs, protecting the lungs, heart and major blood vessels.
The sternum manubrium connects to the top costal cartilages. The sternum gladiolus is located in the sternum middle, and it directly connects to the ribs (from three to seven). Xiphoid process is used for muscle connection, but it does not attach to the ribs.
The sternum injuries are often due to sudden forces, such as in vehicle accidents. Sternum fracture is often painful and serious, as it may also cause rib fractures or myocardial contusion.