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Inferior and Medial View – Bony Pelvis

by James Pickering, PhD
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    00:00 also the ischiopubic ramus which runs away towards the ischial bone. Here, if we look at the lateral view. So, again, we have got a hemisected pelvis here and then we are looking inferiorly from the bottom looking up into the pelvis on this diagram on the right hand side. Again, we can recognise various structures, we can recognise the pubic symphysis here.

    00:18 We can recognise the pubic symphysis. This time it’s inferior aspect here. We can recognise the superior pubic ramus and the inferior pubic ramus here. We, again, can recognise the pelvic brim. We can look posteriorly and see the sacral promontory which we can indicate here and again, we can see the ischial tuberosities here and the ischial spines here. We can also see those on this inferior view where we have the ischial tuberosities here and the ischial spines here. And if you remember, these are important because this is the landmarks that attach the sacrotuberous and the sacrospinous ligaments to the sacrum.

    01:02 So, let's remind ourselves of the greater sciatic notch which we can see here and the lesser sciatic notch which we can see here. These greater and lesser sciatic notches are converted into foramina via these two ligaments. We can see from the ischial spine running towards the sacrum, we have the sacrospinous ligament. And we can see running from the ischial tuberosity also up towards the sacrum, we can see we have the sacrotuberous ligament.

    01:38 These two ligaments are really important. As we spoke about, during the lecture on the branches of the internal iliac, that converting these greater and lesser sciatic notches into greater and lesser sciatic foramina. And these are important apertures, important holes, as they allow structures to pass in and out of the pelvis. They allow the superior, inferior gluteal blood vessels to pass from the pelvis to the gluteal region. We will see that it allies the piriformis, an important muscle to pass out of the pelvis. And it gives the potential for blood vessels to pass into the perineum passing underneath the pelvic floor and into the peritoneum like the internal pudendal artery did. Again, we can see these ligaments passing through to the sacrum here where we have the ischial tuberosity, we can see the sacrotuberous ligament and we can see ischial spine. We have the sacrospinous ligament. Once again, I just want to draw your attention to the obturator foramen, which we can see here. This foramina allow the obturator nerve, artery and the vein to leave the pelvis and pass to the medial aspect of the thigh.


    About the Lecture

    The lecture Inferior and Medial View – Bony Pelvis by James Pickering, PhD is from the course Pelvis.


    Included Quiz Questions

    1. Sacrospinous ligament
    2. Ischial tuberosity
    3. Sacrotuberous ligament
    4. Anterior sacroiliac ligament
    5. Sacrum

    Author of lecture Inferior and Medial View – Bony Pelvis

     James Pickering, PhD

    James Pickering, PhD


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