#MuscleMonday! Today let’s look at the Sternocleidomastoid.

The Sternocleidomastoid is the largest and most superficial muscle located on the lateral (outer) side of the neck.

It is often abbreviated as the SCM.

The Sternocleidomastoid has its origin on 2 points: the manubrium of the sternum (Sterno-) and the clavicle (-cleido-).

Then it ascends and inserts on the mastoid process (-mastoid) of the skull.

ACTIONS:

  • The Sternocleidomastoid acts to rotate the head to the opposite side

  • Flexes the neck forward (front part of the SCM)

  • Extends the head backwards (back part of the SCM).

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