sternal angle
The sternal angle is the point where the costal cartilage attaches the second rib to the sternum. This is an important anatomical landmark to remember--it is used to find the valves when auscultating the heart! The costal margins are formed by the medial borders of the 7th through 10th costal cartilages. They are easily palpable and extend inferolaterally from the xiphisternal joint. The sternal notch/jugular notch is the notch located at the superior border of the manubrium, between the sternal ends of the clavicles. The sternoclavicular joints are simply the joints connecting the sternum with the clavicles. Finally, the xiphoid process is the bone that makes the inferior part of the sternum.