Definition: broad central ensheathing aponeurosis of the back; gives origin to internal oblique, transversus abdominis, and part of the latissimus dorsi muscles; exhibits three layers: posterior, middle, and anterior—the posterior and middle layers surround the erector spinae muscles and the middle and anterior layers surround the quadratus lumborum muscle.
Synonym(s): fascia thoracolumbalisTA, lumbodorsal fascia, thoracolumbar aponeurosis
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