Thorax: Diaphragm

by Craig Canby, PhD

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    Welcome to this lecture on “The Diaphragm”. I want you to keep in mind kind of a silly rhyme. And that is - C345 keeps the diaphragm alive. At the end of this lecture, you should be able to answer the following objectives. One, describe the general structure of the diaphragm and its surface projections. List the causes of an elevated hemidiaphragm. Describe its muscular parts and attachments. Describe the apertures of the diaphragm and the vertebral level of transmitted structures that is aorta, oesophagus and inferior vena cava. Describe the location of potential herniation sites through the diaphragm. Describe its arterial supply, venous drainage and innervation of the diaphragm. And then we’ll take a look at the key take-home messages with the summary slide and then provide attribution for the images that are used throughout this lecture. I will begin here briefly to take a look at the body map and we’ll focus first on the left-hand image and the surface projections of the diaphragm on the right side of the individual here. The diaphragm would ascend after expiration to a point just below the nipple. It is higher on the right side than it would be on the left side. And we’ll be able to explore the reason that the right side of the diaphragm is at a higher level than the left. This slide depicts the general structure of the diaphragm. We see the diaphragm right along here and then extending over to the left side. It does separate the thoracic and abdominal cavities from one another yet does provide for the transmission of structures between the two cavities, as we’ll explore a bit later. It is a musculotendinous structure whereas we have two domes that are more muscular in their construction. And then we have a...

    About the Lecture

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

    • Overview of the diaphragm
    • Radiograph of diaphragm
    • Attachments
    • Blood supply
    • Innervation

    Included Quiz Questions

    1. Rib 5
    2. Rib 4
    3. 5th intercostal space
    4. 4th intercostal space
    5. Rib 6
    1. Lumbar and costal muscular parts
    2. Sternal and lumbar muscular parts
    3. Sternal and costal muscular parts
    4. Sternal muscular part and central tendon
    5. Costal muscular part and central tendon
    1. Right crus
    2. Left crus
    3. Medial arcuate ligament
    4. Lateral arcuate ligament
    5. Central tendon
    1. TX
    2. TIV
    3. TVI
    4. TVIII
    5. TXII

    Author of lecture Thorax: Diaphragm

     Craig Canby, PhD

    Craig Canby, PhD

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