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Medical Definition of Thoracolumbar fascia
1. The fascia which covers the deep muscles of the back; it is attached to the angles of the ribs and to the spines of the thoracic, lumbar, and sacral vertebrae, to the transverse processes of the lumbar vertebrae, to the lower border of the twelth rib and to the iliac crest, as well as to the lumbocostal, iliolumbar, intertransverse, and supraspinous ligaments. Synonym: fascia thoracolumbalis, lumbodorsal fascia, thoracolumbar aponeurosis. (05 Mar 2000)