Thorax: Muscles and thoracic wall

by Craig Canby, PhD

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    Welcome to this lecture on “The Thoracic Wall”. This slide depicts the learning objectives that you should be able to answer at the conclusion of this lecture. First, describe the osteology of the thoracic wall that is ribs, sternum and thoracic vertebrae and the intercostal spaces. Compare and contrast the movements of the thoracic wall and cavity. Describe the thoracic apertures. Categorize thoracic muscles as extrinsic and intrinsic. Describe the attachments, innervation and actions of the thoracic muscles. Describe the neurovascular structures of the thoracic wall. And then we'll summarize the key take-home messages from this lecture. And then we'll provide attribution for the images that were used throughout this presentation. This is our body map and the thoracic wall will have an anterior aspect to it, a lateral aspect and then we also have posterior structures that are associated with the thoracic wall. So, that will be our focus for the remainder of this presentation. And that we'll begin with the relevant osteology. And so, our focus here will be on the ribs, sternum and thoracic vertebrae. But first, we need to understand the fact that we have 12 pairs of ribs. And we can count those 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 and then, more posteriorly, we can see 11 and 12. If we stick with the posterior view, you can see that there are spaces between the ribs and these are termed intercostal spaces. We will have a total of 11 intercostal spaces. Ribs can be classified on the basis of their attachments and whether or not they are true ribs or false ribs. We can categorize ribs as being vertebrosternal, vertebrochondral or simply vertebral. Vertebrosternal ribs are the first seven pairs 1, 2, 3, 4, 5, 6 and then here is 7....

    About the Lecture

    The lecture Thorax: Muscles and thoracic wall by Craig Canby, PhD is from the course Abdominal Wall. It contains the following chapters:

    • Osteology
    • Movements
    • Muscles of the thorax
    • Blood supply to the thoracic wall
    • Innervation of thoracic wall

    Quiz for lecture

    Test your knowledge with our quiz for lecture Thorax: Muscles and thoracic wall.

    1. Rib 8
    2. Rib 10
    3. Rib 7
    4. Rib 11
    5. Rib 12
    1. Rib 12
    2. Rib 1
    3. Rib 7
    4. Rib 9
    5. Rib 10
    1. Pectoralis minor muscle
    2. Pectoralis major muscle
    3. Subclavius muscle
    4. Serratus anterior muscle
    5. Levator costarum muscle
    1. Subcostal muscle
    2. External intercostal muscle
    3. Internal intercostal muscle
    4. Innermost intercostal muscle
    5. Transversus thoracis muscle
    1. Aorta
    2. Superior intercostal artery
    3. Internal thoracic artery
    4. Musculophrenic artery
    5. Superior epigastric artery
    1. Long thoracic nerve
    2. Intercostal nerve
    3. Lateral pectoral nerve
    4. Medial pectoral nerve
    5. Thoracodorsal nerve

    Author of lecture Thorax: Muscles and thoracic wall

     Craig Canby, PhD

    Craig Canby, PhD

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