• Origin:
  Sternal Head: upper part of anterior surface of manubrium sternum
  Clavicular Head: upper surface of medial third of clavicle
• Insertion: 
  Sternal Head: lateral one half of superior nuchal line of occipital bone
  Clavicular Head: outer surface of mastoid process
• Action:
  Unilateral contraction: rotates head to opposite side (contraversion); flexes head to same side
  Bilateral contraction: draws head forwards (protracts) and brings about anterior flexion of the neck.
  In retroflexion, may act to further exacerbate retroflexion.

(vv)SCM without US.mp4(tt)

(vv)SCM.mkv(tt)