Head and neck / Superficial neck
Sternocleidomastoid
Bilaterally flexes the neck. unilaterally laterally flexes to the same side and rotates the head to the opposite side
- Origin
- Manubrium of the sternum and medial clavicle
- Insertion
- Mastoid process of the temporal bone and lateral superior nuchal line
- Primary actions
- Bilaterally flexes the neck. unilaterally laterally flexes to the same side and rotates the head to the opposite side
Educational anatomy reference only. This page does not diagnose pain, injury, or movement limitations.
From anatomy to action
Explore the movement, not just the muscle.
A single muscle rarely explains a movement by itself. Use the related movement content to see how this anatomy may contribute, then choose a focused program when you want a complete progression.
Movement guides and exercises
Complete guided progressions
Ready to follow a focused plan?
These programs include this muscle through a related guide or corrective recipe.