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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

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