- origin: C7 and T1-T6 thoracic transverse processes and articular processes of 4th, 5th, and 6th cervical vertebrae;
- insertion: between superior and inferior nuchal lines of the occipital;
- action: extnesion of lateral flexion of the neck and head, and rotates it to the opposite side;
- nerve supply: posterior rami of the cervial nerves;
- synergists: splenius group, Semispinalis Cervicis
