Name for arcuate line comes from Latin arcus which means bow or arch. Arcuate line is rounded ridge-like line on the medial surface of the ilium. It projects from the auricular apex posteriorly to the iliopectineal eminence anteriorly where it becomes continuous with the pectineal line.
Arcuate line serves as a boundary line between the true and false pelves. It also actgs to strengthens the pelvis against the loads transferred from the femur to the sacrum.