Internal Oblique – Anterolateral Abdominal Wall

by James Pickering, PhD

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    00:01 Let's move on and deep to this muscle, deep to external oblique, we find internal oblique.

    00:08 So here on the diagram, we can see external oblique here has been cut away, and we're left with this muscle that's radiating underneath.

    00:16 So here we have some details.

    00:18 You can notice that the fibers of internal oblique run in the opposite direction to that of external oblique, and this is really important.

    00:28 So external oblique is running down in this direction, like you're putting your hands in your pockets, external oblique.

    00:35 We've got some details of its origin and its insertion here.

    00:40 It originates from the iliac crest from the pelvic bone and also an important piece of fascia most posteriorly called thoracolumbar fascia.

    00:50 It also attaches to the inguinal ligament, and we'll see that in more detail when we look at the inguinal canal.

    00:57 As it's running up in this direction, we can see an insert into ribs 10 and 12.

    01:02 And also lies some aponeurosis, which we'll talk about the internal oblique muscles attached to the linea alba.

    01:11 Nerve supply again is similar to external oblique and rectus abdominis.

    01:15 And it's the thoraco-abdominal nerves coming from the spinal cord T6 through to T12.

    01:22 Internal oblique does the same function as external oblique, it helps to flex and rotate the trunk enabling us to move and importantly like I mentioned before, it helps to compress the internal viscera, increase the pressure and support the abdominal cavity.

    01:38 So we've got internal oblique that lies deep to external oblique.

    About the Lecture

    The lecture Internal Oblique – Anterolateral Abdominal Wall by James Pickering, PhD is from the course Abdomen.

    Included Quiz Questions

    1. Anterior iliac crest
    2. Linea alba
    3. Inguinal canal
    4. The outer surface of ribs 5–12
    5. Pubic symphysis
    1. It flexes and rotates the trunk.
    2. It does not originate from the inguinal ligament.
    3. It extends and rotates the trunk.
    4. It relaxes the internal viscera by decreasing intra-abdominal pressure.
    5. It inserts onto the costal cartilage of ribs 5–7.

    Author of lecture Internal Oblique – Anterolateral Abdominal Wall

     James Pickering, PhD

    James Pickering, PhD

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