Sternocleidomastoid Muscle Flashcards

Flashcards are a great way to memorise information about the sternocleidomastoid muscle. Test your knowledge of anatomy using the sternocleidomastoid flashcards below.

Press a flash card to reveal the answer.

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

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