| sternum | The breastbone. The sternum articulates with the ribs 1 through 7 on either side of the chest. (27 Sep 1997) |
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| body of sternum | The middle and largest portion of the sternum, lying between the manubrium superiorly and the xiphoid process inferiorly. Synonym: corpus sterni, gladiolus, mesosternum, midsternum. (05 Mar 2000) |
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| manubrium of sternum | The upper segment of the sternum, a flattened, roughly triangular bone, occasionally fused with the body of the sternum, forming with it a slight angle, the sternal angle. Synonym: manubrium sterni, episternum, presternum. (05 Mar 2000) |
| clavicular notch of sternum | A hollow on either side of the upper surface of the manubrium sterni which articulates with the clavicle. Synonym: incisura clavicularis, clavicular facet. (05 Mar 2000) |