Left-right determination of ribs
The following characteristics can be used as a guide to determine left and right.
On the superior surface of the first rib, there is a small projection (Scalene tubercle) somewhat central and medial to the rib body. There are two shallow grooves anteriorly (Groove for subclavian vein) and posteriorly (Groove for subclavian artery).
There is a rough and weak elevation (Tuberocity for serratus anterior) on the somewhat lateral to the superior surface of the second rib. Medially, there is a shallow groove corresponding to a typical rib groove.
On other ribs, upper margin is blunt, lower margin is sharp. Costal grooves are present on the medial side of the lower margin.