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the strong ligament that connects the fourth and fifth lumbar vertebrae with the ilium, spanning the "notch" between the vertebral column and the wing of the ilium.
Synonym(s): ligamentum iliolumbale [TA]
Etymology: 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.
The ligament extending from the fourth and fifth lumbar vertebrae to the iliac crest.
See also: ligament