Completar Frases Thoracic cageVersión en línea Identify the bones that form the thoracic cage. Boxes that require multiple answers are in alphabetical order. por Kristani Cochran 1 superior costal false middle body cartilage 1 cage 7th manubrium floating true 12 11 process 8 7 10 xiphoid ribs sternum thoracic inferior The is composed of quite a few parts . First is the , which is an elongated flat bone forming the middle part of the anterior thoracic wall . It is composed of three parts , the ( which is the portion ) , ( the portion ) , and ( the portion ) . The are also a part of this cage , - attach anteriorly to the sternum through strips of and are known as ribs . - are ribs that only attach to the cartilage . - do not attach to anything are known as ribs .