Sternum is the flat bone made by three parts (manubrium, corpus et processus xiphoideus) and synchodroses between them. Sternum stabilizes the ribs through their cartilages, limits the mobility of the thoracic spine, and, therefore, protects chest organs*.

* Liebsch C, et al. The rib cage stabilizes the human thoracic spine: An in vitro study using stepwise reduction of rib cage structures. PLoS ONE. 2017;12(6):e0178733–13.
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Thoracic cage. Front view Sternum in situ
Sternum in situ. The frontal aspect.

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Sternum. Frontal and anterior oblique view Sternum with the anatomical terminology
Frontal and anterior oblique aspect of the sternum.
The list of terms: Manumbrium sterni
Corpus sterni – Body of sternum
Processus xiphoideus – Xiphoid process
Synchondrosis manubriosternalis – Manubriosternal synchondrosis
Synchondrosis xiphisternalis – Xiphisternal synchondrosis
Incisura jugularis – Jugular notch
Incisura clavicularis – Clavicular notch
Incisurae costales – Costal notches

360° rotation of the sternum