In its natural position, the inclination of the bone is oblique from above, downward and forward. In early life, the body of sternum consists of four segments or sternebrœ. It consists of three parts, from above downward: Its top is also connected to the Sternocleidomastoid muscle. Its upper end supports the clavicles (Collar bones), and its margins articulate with the cartilages of the first seven pairs of ribs. The sternum is an elongated, flattened bone, forming the middle portion of the anterior wall of the thorax. The sternum is sometimes cut open (a median sternotomy) to gain access to the thoracic contents when performing cardiothoracic surgery. It connects to the rib bones via cartilage, forming the rib cage with them, and thus helps to protect the lungs, heart and major blood vessels from physical trauma. The sternum (from Greek στέρνον, sternon, "chest" and hebrew pronounced "Shamokin" also meaning chest) or breastbone is a long, flat bone located in the center of the thorax (chest). Risk calculators and risk factors for SternumĮditor-In-Chief: C. US National Guidelines Clearinghouse on Sternum Articles on Sternum in N Eng J Med, Lancet, BMJ
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