![]() Slight indentations on the lateral sides of the manubrium provide attachment points for the costal cartilages of the ribs. The clavicles meet the manubrium at the concave clavicular notches to form the sternoclavicular joint, the only point of skeletal attachment between the pectoral girdle of the shoulder and the axial skeleton of the thorax. ![]() It forms joints with the clavicles and the first and second pairs of ribs through their costal cartilages. The manubrium is the widest and most superior region of the sternum. ![]() In fact, the name manubrium means “handle,” gladiolus means “sword,” and xiphoid means “sword-shaped.” The shape of the sternum looks somewhat like a sword pointing downwards, with the manubrium forming the handle, the body forming the blade, and the xiphoid process forming the tip. The sternum develops as three distinct parts: the manubrium, the body of the sternum (sometimes called the gladiolus), and the xiphoid process. It is a flat bone about six inches in length, around an inch wide, and only a fraction of an inch thick. The sternum is located along the body’s midline in the anterior thoracic region just deep to the skin. It also protects several vital organs of the chest, such as the heart, aorta, vena cava, and thymus gland that are located just deep to the sternum. Several muscles that move the arms, head, and neck have their origins on the sternum. The sternum, commonly known as the breastbone, is a long, narrow flat bone that serves as the keystone of the rib cage and stabilizes the thoracic skeleton.
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