Home > Anatomy & Physiology > Muscles > Sternocleidomastoid |
Sternocleidomastoid |
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Origin
- Anterior surface of the upper sternum
- Inner part of the clavicle
Insertion
- Mastoid process (behind the ear)
Actions
- Contraction on both sides: Flexes the neck
- Contraction on one side only: Laterally flexes (side bends) to the same side and rotates to the other side
Innervation
Daily uses
- Looking at the floor
- Looking over your shoulder
- Holding the phone between your ear and shoulder
How can I stretch it?
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