Xiphisternal joint

The xiphisternal joint (or xiphisternal symphysis) is a location near the bottom of the sternum, where the body of the sternum and the xiphoid process meet. It is structurally classified as a synchondrosis, and functionally classified as a synarthrosis. The joint usually ossifies by the fourth decade of life, forming a synostosis.

It is the T9 vertebra.