The 'costal margin is the medial margin formed by the false ribs -- specifically, from the seventh rib to the tenth rib. Image File history File links Download high resolution version (526x650, 34 KB)From Grays Anatomy Anterior surface of sternum and costa cartilages. ... Latin is an ancient Indo-European language originally spoken in Latium, the region immediately surrounding Rome. ... Elseviers logo Elsevier, the worlds largest publisher of medical and scientific literature, forms part of the Reed Elsevier group. ... The tenth rib has only a single articular facet on its head. ...