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origin: the common broad thich tendon with Iliocostalis Lumborum, fibers from the transverse and mamillary processes of the lumbar
        vertebrae and lumbrosacral aponeurosis;
insertion: the tips of transverse process of all thoracic vertebrae and the lower 9 or 10 ribs between the tubercles and angles;
action: acting unilaterally, extension of vertebral column and flexion to the same side;  acting bilaterally, extension and hyperextension
        of vertebral column; draws ribs down;
nerve supply: posterior rami of the spinal nerves;
synergists: iliocostalis luborum, Iliocostalis thoracis, Quadratus Lumborum