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Synonym: breastbone

German: Sternum, Brustbein

1 Definition

The sternum consist of three parts and is a necktie shaped flattened bone which formes the anterior border of the thorax.

2 Anatomy

The sternum consist of following three parts:

  • Manubrium (manubrium sterni)
  • Body (corpus sterni, gladiolus)
  • Xiphoid Process (processus xiphoideus, xiphisternum, metasternum)

2.1 Manubrium

The manubrium presents on its superior surface three notches. The middle one is called suprasternal notch or jugular notch and the two lateral ones are articulation surfaces which form together with the two clavicles the sternoclavicular joint. The inferior border articulates with the body of the sternum and the lateral bordes articulate with the 1. rib and partly with the 2. rib.

The manubrium serve as attachment point for the following muscles:

2.2 Body

The superior border of the body articulates with the manubrium and forms the sternal angle (Angulus Ludovici). The inferior border narrows and articulates with the xyphoid process. Lateral the body of the sternum is connected to part of the 2. rib, the 3., 4., 5. and 6. rib via cartilage. The fused cartilages of the 7., 8. and 9. rib comes in contact with the angle between body and xyphoid process.

The pectoralis major muscle also attaches to the anterior surface of the body of sternum.

2.3 Xyphoid process

The xyphoid process is the smallest part of these three parts and is ossified in adults. The superior border articulates via synchondrosis in young individuals and via synostosis in adultes with the body.

The xyphoid process serves as attachment point for the following structures:

3 Clinical significance

4 References

  • Sternum - Wikipedia, the free encyclopedia[2]
  • Xiphoid process - Wikipedia, the free encyclopedia[3]

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