Sternum

In Humans, the sternum was a flat bone that ran down the center of the chest, to which the ribs were attached. When Darth Vader was put in a life-supporting armor following his duel with Obi-Wan Kenobi, the medical droids replaced his sternum with a perforated metal plate that could accommodate the cables running to a chest computer.

The mythosaurs that lived on the Outer Rim world of Mandalore possessed sternums composed of rigid bone. The sternum of a dead mythosaur was removed and carved to create the ceremonial mask of Mandalore the First, after his Taung warriors conquered slaughtered the mythosaurs.