Longissimus Cervicis

origin: transverse process of the first to fifth thoracic vertebrae;
insertion: transverse processes of the 2nd to 6th cervical vertebrae and
            sometimes to the atals transverse process;
action: acting unilaterally, laterally flexes the neck; acting
        bilaterally, extension and hypertension of the neck;
nerve supply: posterior rai of the spinal nerves;
synergists:     Semispinalis capitis ,     [Semispinalis Cervicis ,
              Iliocostalis Cervicis ,   Longissimus Capitis ,   Spinalis Cervicis ,
            and the deep posterior spinal group;

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