- origin and insertion: pairs of small muscles joining the spinous process of adjacent vertebrae, one on each side of the interspinalis ligament; 
       continuous in the cervical region extending from the axis to the 2nd thoracic vertebrae and in the lumbar region from the first lumbar 
       vertebrae to the sacrum;
- action: extension and hyperextension of the spine;
- nerve supply: posterior rami of the spinal nerve;
- synergists: multifidi, rotators, Intertransversarii groups

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

Last updated by Data Trace Staff on Tuesday, August 16, 2011 12:13 pm