Hello again, everyone. It’s Matt from Kenhub!
And in this tutorial, we will discuss the function and anatomy of the sternocleidomastoid
muscle. The sternocleidomastoid muscle is a two-headed
muscle of the neck. The two heads are called the sternal head and the clavicular head. The muscle lies very superficially so that
it is both easily visible and palpable. The carotid pulse may be felt in the middle third
of the front edge. The sternocleidomastoid is innervated by the
accessory nerve and by direct branches of the cervical plexus. The sternal head originates from the sternal
manubrium and the clavicular head from the middle part of the clavicle. The insertion is the mastoid process of the
temporal bone and the superior nuchal line of the occipital bone. Under the sternocleidomastoid region runs
a neurovascular bundle containing the common carotid artery, the internal jugular vein,
the vagus nerve, highlighted here in green, and the cervical ansa. A unilateral contraction of the sternocleidomastoid
muscle flexes the cervical vertebral column to the same side called lateral flexion and
rotates the head to the opposite side. A bilateral contraction leads to an elevation
of the head, otherwise called dorsal extension. In addition, it supports inspiration, providing
that the head is holding still. This video is more fun than reading a textbook,
right? If you want more videos, interactive quizzes, articles, and an atlas of human anatomy,
click on the “Take me to Kenhub” button. It is time to say goodbye to your old textbooks
and say hello to your new anatomy learning partner, Kenhub! See you there! https://www.kenhub.com

17 thoughts on “Sternocleidomastoid Muscle: Function & Anatomy – Human Body | Kenhub”

  1. How does contraction of both SCMs cause head elevation? It should cause head flexion, not elevation or extension

  2. Is the origin of the clavicular head in the medial aspect of the cavicle rather than the middle part of the clavicle?

  3. the origin of the clavicular head is the medial third of the superior surface of the clavicle and NOT THE MIDDLE PART.

  4. Hi everyone! This was the video about one of the most important muscles of the neck. Hope you enjoyed it! Tell us what other videos would you like to see on our Youtube channel? And as a next step in your learning schedule, take this quiz on the muscles of the anterior neck: https://khub.me/w9b6x Have fun! 🙂

  5. I have a few comments about your video. I feel it's not organized very well, it just jumps all over the place from the bone to nerves and vascularization then it starts again, also just a tad of animation or even 2 different images would be good as I don't understand those unilateral contraction, dorsal extension etc…

  6. In my books is written that. Sternoceidomastoid muscle has only one end point on mastoid process. And you said second one. Thank you so much

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