What is the name of the inferiormost part of the sternum?

The inferiormost part of the sternum is called the xiphoid process. This small, cartilaginous structure eventually becomes ossified in adulthood and serves as an important anatomical landmark. Its location at the bottom of the sternum has significance as it provides attachment for abdominal muscles and the diaphragm. The xiphoid process is essential for identifying areas on the body for CPR and other medical procedures, as well as being a point of reference for the lower margins of the thoracic cavity.

In contrast, the manubrium is the upper part of the sternum, the body is the central portion, and the sternal angle is where the manubrium meets the body, which is more of a functional angle rather than a physical part of the sternum itself. Thus, the xiphoid process is accurately identified as the lowest part of the sternum.