Which part forms the inferior portion of the sternum?

• A. Body
• B. Xiphoid Process
• C. Manubrium
• D. Clavicle

Answer: (B)

The question tests knowledge of how the sternum is segmented and which part sits at the bottom. The sternum has three regions: the upper manubrium, the central body, and the inferior tip known as the xiphoid process. The xiphoid process forms the lowest point of the sternum; it often starts as cartilage in youth and ossifies with age. It serves as an attachment site for abdominal muscles and for the diaphragm, which helps distinguish it as the inferior landmark of the sternum. The manubrium is the top portion, and the central portion is the body. The clavicle is a separate bone that articulates with the manubrium, not part of the sternum itself.