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origin and insertion: pairs of small muscles, anterior and posterior, on
each side of the spine joining the transverse processes of
adjacent vertebrae;  
they extend from the atlas to the 1st
thoracic vertebrae and from the 10th throracic vertebrae to the
last lumbar vertebrae;
action: acting unilaterally, lateral flexion of the spine; acting
bilaterally, extension and hyperextension of the spine;
nerve supply: anterior and posterior rami of the spinal nerves;
synergists: interspinalis, rotators, Multifidus groups;

Original Text by Clifford R. Wheeless, III, MD.