![]() The sternal angle is commonly used as an aid to count ribs, as it marks the level of the 2nd costal cartilage. This can be felt as a transverse ridge of bone on the anterior aspect of the sternum. Inferiorly, the manubrium articulates with the body of the sternum, forming the sternal angle. On the lateral edges of the manubrium, there is a facet (cartilage lined depression in the bone), for articulation with the costal cartilage of the 1st rib, and a demifacet (half-facet) for articulation with part of the costal cartilage of the 2nd rib. These fossae articulate with the medial ends of the clavicles, forming the sternoclavicular joints. Either side of the jugular notch, there is a large fossa lined with cartilage. The superior aspect of the manubrium is concave, producing a depression known as the jugular notch – this is visible underneath the skin. The manubrium is the most superior portion of the sternum. The cartilage ossifies to bone during adulthood. ![]() In children, these elements are joined by cartilage. The sternum can be divided into three parts the manubrium, body and xiphoid process.
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