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Spinalis Thoracis

Origin: the spinous process of the 1st and 2nd lumbar vertebrae, the thoracic vertebrae 10, 11, 12;
insertion: the spinous process of the thoracic vertebrae 3-8 and sometimes 9;
action: acting unilaterally, lateral flexion of the spine; acting bilaterally, extension and hyperextension of the spine;
nerve supply: posterior rami of the spinal nerves;
synergists:  Semispinalis Thoracis,  Longissimus Thoracis, iliocostalis thoracis,  Iliocostalis Lumborum , longissimus thoracis,
            Quadratus Lumborum

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