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with as we look at the attachment sites later
on of the gluteal muscles. Now let’s turn
to the ischium. The ischium is most posteriorly
located, and it’s the postero-inferior aspect
of the hip bone, and also the acetabulum.
So here on this lateral surface where we can
see the acetabulum, if the ilium was superior
from this line here, then the ischium is coming
down into this region. So the ischium is everything
below this line we can see here. Again, it’s
uniting with the pubis and the ilium at the
acetabulum. We can see the body of the ischium
on this medial surface. So here, the organs
of the pelvis have been removed and we can
see a nice clear body of the ischium. Remember,
this connects the ilium and the pubis at the
acetabulum. We can see it’s on the acetabulus
surface here. We can also recognize the ramus
of the ischium, and the ramus of the ischium
is important. It connects the inferior pubic
ramus of the pubic bone. So here, if we look
at this lateral view, we can see running down
here from the body of the ischium, we have the
ramus of the ischium, and that runs towards
the inferior pubic ramus. Collectively, that
forms the ischiopubic ramus here. We can see
that on this lateral surface. We can also
see it coming down here on this medial surface,
and we can see it running down here on this
superior surface. It’s also going to form
the obturator foramen which we can see this
large space here. If we look at the ischium
in some bony landmarks, then some important
bony landmarks protruding posteriorly from
the ischium, we have two. We have the ischial
spine and the ischial tuberosity. Seen here
on the medial surface view, but projecting
posteriorly, we have the ischial spine superiorly
and the ischial tuberosity inferiorly. On
this lateral view, we can also see it.
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So again here is anteriorly, and projecting posteriorly,
we have the ischial spine and we have the
ischial tuberosity. These bony landmarks are
important as they create the greater and lesser
sciatic notches. We can see here, we have
the greater sciatic notch running from the
posterior inferior iliac spine all the way
around to the ischial spine here, the greater
sciatic notch running around here. We then
have running from the ischial spine this little
concavity here, and that is the lesser sciatic
notch. Later on, we’ll see how these are
converted into foramina. But now let’s turn
to the pubis or the pubic bone. This is the