Many muscles like manubrium, diaphragm attach to the 5th,6th and 7th ribs and the xiphoid process.
- The manubrium (manubrium sterni) has four edges and a quadrangular form.
- The superior section of the manubrium sterni contains the suprasternal notch (jugular notch). The left and right clavicular notches are present on both sides.
- The longest portion of the sternum is called the body (mesosternum). Where the costal cartilages of the third through seventh pairs of ribs interface inferior to the sternal angle, it is flat with depressed ridges along the sides.
- The xiphoid process serves as an attachment point for the abdominal muscles, including the rectus abdominis, transversus abdominis, external and internal obliques, and diaphragm, the most crucial muscle for respiration.
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