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Hello again, everyone. It’s Matt from Kenhub!
And in this tutorial, we will discuss the origin, insertion, innervation, and function
of the intercostal muscles. The intercostal muscles are a group of intrinsic
chest wall muscles occupying the intercostal spaces. The intercostal muscles consist of
the external intercostal muscles which course from the lower border of a rib ventrocaudally
to the upper border of the rib below. Ventrally, they are bordered by the external
thoracic facscia. The internal intercostal muscles originate
at the upper border of a rib and insert ventrocranially at the lower border of the rib above. The last group are the innermost intercostal
muscles which separate from the internal intercostal muscles and insert behind the costal grooves.
Inwards, they are bordered by the internal thoracic fascia. The fibrous space between the internal and
innermost intercostal muscles and the lower border of the rib above forms the intercostal
tunnel. These tunnels provide passage for the intercostal arteries, veins, and the intercostal
nerves which supply the intercostals and arise from the thoracic nerves. The task of the intercostal muscles is to
tense the intercostal spaces during deep inspiration and support the breathing mechanism. The contraction
of the external intercostal muscles causes an elevation of the ribs, functioning as inspiratory
breathing muscles… Whereas both the internal and innermost intercostal
muscles lower the ribs, functioning as expiratory breathing muscles. 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
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15 thoughts on “Intercostal Muscles – Function, Area & Course – Human Anatomy | Kenhub

  1. Hi can you plz help me
    I'm a free runner and I recently got a trampoline. I have used it non stop and now every time I land on my feet I get a pain in my upper back/chest. Is it probable that I have pulled these muscles

  2. Hi everyone! Hope we were able to shed some light on the intercostal muscles and help you pick the right anatomy learning method for you. Tell us in the comments: What is your favorite way to learn anatomy? Also, don't forget to check out our fun video tutorials and interactive quizzes: All you need to kick some gluteus maximus in anatomy. Happy studying! 🙂

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