Origin
Manubrium of sternum & medial 1/4 of clavicle’s superior surface
Insertion
Mastoid process & anterior portion of superior nuchal line
Actions
- Unilateral contraction: ipsilateral flexion and contralateral rotation
- Bilateral contraction: Head/neck extension, head/neck flexion, & assists in inspiration by elevating clavicle and manubrium of sternum
Innervation
- Accessory nerve (CN XI)
- Branches of cervical plexus (C2-C3)
Blood Supply
- Occipital artery
- Superior thyroid artery
- Suprascapular arteries
Would you like to learn more about the sternocleidomastoid muscle? Then check out the sternocleidomastoid muscle article and video by clicking the link below: Sternocleidomastoid Muscle Anatomy
Support Bodyworks Prime
Running a website and YouTube channel can be expensive. Your donation helps support the creation of more content for my website and YouTube channel. All donation proceeds go towards covering expenses only. Every contribution, big or small, makes a difference!
