Pelvic Walls

00:01 Now, let's have a look at some pelvic walls.

00:04 So here again, we can remind ourselves anteriorly.

00:06 We have the pubic symphysis.

00:08 We then have the pubic rami extending laterally.

00:11 And here these form the anterior wall.

00:14 The posterior wall is formed by the sacrum and the coccyx.

00:18 Laterally, we're going to find we have the pelvic bones which are inferior to the linea terminalis.

00:24 And that's a line that's running alongside the pelvic inlet demarcation.

00:29 So here we can also see laterally. We have the sacrospinous ligament and we have the sacrotuberous ligament.

00:35 The greater sciatic foramen and the lesser sciatic foramen, also form this lateral wall of the pelvis.

00:42 There's a number of muscles which also form this lateral wall.

00:46 So lying over the obturator foramen, we have obturator internus.

00:51 Passing through the greater sciatic foramen, we have piriformis muscle.

00:55 And if we zoom closer in we can see there's a number of openings on this lateral wall that have been created by these various muscles and these ligaments.

01:06 So here we can see the greater sciatic foramen, which has piriformis muscle passing from the sacrum all the way to the greater trochanter of the femur.

01:14 We can see piriformis here, then superiorly as the suprapiriform foramen.

01:20 And then we also have an infrapiriform foramen here.

01:24 These are important as they live, for example, the superior gluteal nerve, the superior gluteal artery and vein to pass through this region.

01:32 We also have coming out of the infrapiriform foramen.

01:35 The sciatic nerve, the inferior gluteal nerve, and the inferior gluteal artery.

01:40 So these are important structures that are passing through this space to go and help supply structures within the gluteal region.

01:48 We have the letter sciatic foramen here.

01:50 And passing through that we have obturator internus.

01:53 And this muscle is substances on the lateral wall of the pelvis, but it's long tendon passes out through that lesser sciatic foramen.

02:03 We also have an intricate and an anatomical structure, which is the pudendal nerve.

02:08 And this is coming away from the sacral plexus and it's passing through the greater sciatic foramen, but then it loops back into the perineum via the lesser sciatic foramen.

02:22 So here we can see that nerve passing out of the pelvis via the greater sciatic foramen.

02:27 And then it passes back into what will soon become the perineum under the pelvic floor via passing through the lesser sciatic foramen.

02:37 And it does this alongside the internal pudendal artery and the internal pudendal vein.

02:43 So these structures are passing out through the greater sciatic foramen, and then they do that to pass underneath the pelvic floor.

02:50 And as they're now underneath the pelvic floor, they're within the perineum.

02:55 Here we see the obturator canal which is going to transmit the obturator nerve and the obturator artery.