All of the following are direct aiculations of the true rib except the

Costosternal joint is not a direct aiculation of the ribs. Ribs directly aiculate with the veebral body by the costoveebral joint, with the transverse process of the veebrae by costotransverse joint, and with costal cailage by costochondral joint. It is the costal cailage that attaches the ribs to the sternum. Hence, costosternal joint is a misnomer and should be correctly mentioned as costosteral joint. Ref: Gray&;s Anatomy 41st edition Pgno: 149