manubriosternal symphysis

ma·nu·bri·o·ster·nal sym·phy·sis

[TA] the later union, by fibrocartilage, of the manubrium and the body of the sternum; it begins as a synchondrosis and becomes a symphysis, occasionally fusing to become a synostosis. Synonym(s): symphysis manubriosternalis [TA], sternomanubrial junction