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image: Sternocleidomastoid


 Articulations :

 Action :

  • Both sides together flex the neck
  • Rotator of the neck
  • Lateral flexor of the neck
  • Extensor of the neck
  • Flexor of the cervical spine
  • Rotator of the cervical spine

Origin :

  • Manubrium of Sternum
  • Clavicle (Medial)

Insertion :

  • Mastoid process of skull

Innervation :

  • Lateral flexor of the cervical spine
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