iliolumbar ligament /-lum″bər/ [L, ilium + lumbus, loin, ligare, to bind] , one of a pair of ligaments forming part of the connection between the vertebral column and the pelvis. Each iliolumbar ligament attaches to a transverse process of the fifth lumbar vertebra and laterally to the ilium and inferiorly passes to the base of the sacrum, where it blends with the sacroiliac ligament.
