Sternocleidomastoid

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Other Names

  • Sterno-mastoid
  • Neck (Front / Sides)
  • Neck Flexors

Heads

  1. Anterior Fibers
  2. Posterior Fibers

Movement

Neck (Atlantooccipital & Atlantoaxial)

  • Flexion [1]
    • Both Sides
  • Rotation [1, 2]
    • Rotation right [Left Sternocleidomastoid]
    • Rotation left [Right Sternocleidomastoid]
  • Lateral Flexion [1, 2]
    • Lateral flexion right [Right Sternocleidomastoid]
    • Lateral flexion left [Left Sternocleidomastoid]
  • Extension [2]

Spine (Cervical)

  • Flexion [1, 2]
    • Both Sides
  • Rotation [1, 2]
    • Rotation right [Left Sternocleidomastoid]
    • Rotation left [Right Sternocleidomastoid]
  • Lateral Flexion [1, 2]
    • Lateral flexion right [Right Sternocleidomastoid]
    • Lateral flexion left [Left Sternocleidomastoid]

Attachments

Origin

  • Sternum [1]
    • Manubrium
  • Clavicle (Medial) [2]

Insertion

  • Skull [1, 2]
    • Mastoid Process

Related Muscles

Sternocleidomastoid

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