Longissimus Capitis
origin: transverse processes of the 1st to 5th thoracic vertebrae and the articular processes of the 4th to 7th cervical vertebrae; insertion: the posterior margin of the mastoid process; action: acting bilaterally, extends and hyperextends head; acting unilaterally, flexes and rotates the head the same side; synergists: Semispinalis capitis , spinalis capitis, Longissimus Cervicis
