There are three processes in the vertebrae that branch of the pedicle. The transverse process, superior articular process and the inferior articular process. Which of the three's function is to articulate with the ribs? What is the name of the "smooth," "swelling" projection of bone that it interacts with?
Of the three, the transverse process interacts with the rib or costa. It interacts via the costatubercular facet or which in latin means the smooth swelling that interacts with the rib or costa.