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Hey, everyone. It’s Matt from Kenhub! And
in this tutorial, we will discuss the serratus anterior muscle. The serratus anterior muscle is a fan-shaped
muscle at the lateral wall of the thorax. Its main part lies deep under the scapula
and the pectoral muscles. It is easy to palpate between the pectoralis major and latissimus
dorsi muscles. In athletic bodies, the muscle may even be
visible to the naked eye along the ribs, underneath the axilla. The serratus anterior muscle originates at
the first to ninth rib and inserts at the ventral surface of the medial border of the
scapula. Because of its course, it has a saw-tooth
or serrated appearance, hence the name “serratus anterior.” The muscle is further divided into three parts.
The superior part consists of the part from the first to second rib, extending to the
superior angle of the scapula. The intermediate part is from the second to
third rib to the medial border of the scapula. And the inferior part is the section from
the fourth to ninth rib to the medial border and inferior angle of the scapula. This part is the most prominent and powerful
one. The innervation is supplied by the long thoracic
nerve, a branch of the brachial plexus. The contraction of the entire serratus anterior
leads to a ventrolateral movement of the scapula along the ribs. Another function of the serratus anterior
is the act of stabilization of the scapula within the shoulder. Finally, in a fixed scapula, the muscle lifts
the ribs and acts as an accessory inspiratory muscle. Due to the pull of the inferior part at the
lower scapula, the shoulder joint is shifted superiorly. This shifting, then, enables the
arm to lift above ninety degrees. In contrast, the superior part depresses the
scapula and thus acts antagonistically. 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!

22 thoughts on “Serratus Anterior Muscle: Function, Origins – Human Anatomy | Kenhub

  1. Sorry, Ventrolateral movement? Is the goal of this video to confuse people with difficult words? You don't even show what the movement looks like.

  2. Serratus anterior always gets me confused.
    I have little bit of medial winging, so it´s recommended to strengthen my serratus anterior.
    But how does it work when serratus anterior protracts/abducts scapula, but my winging decreases with scapular adduction/retraction?

  3. thank you ken ……………………………………………………………………………………..

  4. Superb collection of fine illustrations, very well distinguished and a concise, easy to follow and very well organized narrative. Arguably a better illustrative anatomy than getbodysmart and narrative which rivals the best khanacadamy tutorials. Many thanks!

    Trainer Shawn Personal Fitness Miami Brickell
    479 SW 3rd St Miami FL 33130

  5. Hi guys! Did you like this muscle fact video about the serratus anterior? Let us know on the comments what you enjoy about our anatomy tutorials. But wait, there is more: Check out our quizzes, related articles and atlas sections on the ventral trunk muscles for a deeper understanding of how these muscles work together with the serratus anterior:
    Once you go through that, you'll be able to call yourself a master on the ventral trunk muscles. Have fun learning!

  6. Hi there! This video is very useful like all ur videos♥but i'd love to know what is the meaning of "kenhub"????
    Nice name by the way

  7. great video. if im being picky i would just say that some animations would be great. keep up the good work

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