• Origin

Sternum and Clavicle

• Insertion

Mastoid Process of the Temporal Bone and Occipital Bone

• Agonist(s)

- Scalenes

- Levator scapulae

- Splenius capitis

• Antagonist(s)

- Trapezius

- Latissimus dorsi

- Rhomboids

- Serratus anterior

• Function

Rotation, Flexion and Extension of Head and Neck