Final answer:
The three parts of the sternum are the manubrium, body, and xiphoid process.
Step-by-step explanation:
The sternum is the elongated bony structure that anchors the anterior thoracic cage.
It consists of three parts: the manubrium, body, and xiphoid process. The manubrium is the wider, superior portion of the sternum.
The top of the manubrium has a shallow, U-shaped border called the jugular (suprasternal) notch.
The body is the elongated central portion of the sternum, and it joins with the manubrium at the sternal angle.
The xiphoid process is the narrow, inferior portion of the sternum.
It is small and cartilaginous in younger individuals but tends to ossify and become bony as a person ages.