So we have looked at these definitions. Now
let's put them into some kind of context
by looking at the actual opened
abdomen and see in what we can find.
So here we have an opened abdomen.
We have the
peritoneal cavity has been exposed.
Now here we can see the flaps
of the anterior abdominal wall.
Now lining this surface
will be parietal peritoneum
will be parietal peritoneum.
Tightly associated with the organs
with the visceral peritoneum.
And if it's not visceral
peritoneum, it's going to be
parietal peritoneum running on
the posterior abdominal wall.
And here we have this
peritoneal cavity. Essentially
it is like a balloon has been placed into
the abdomen and it's pushed against the walls
and these organs have protruded into it.
So there is nothing actually
within the peritoneal cavity
except a thin serous fluid.
Because the organs have pushed
through the peritoneum
without actually piercing it; just
like you have pushed your finger
through a balloon. You don't
actually pierce the balloon
but you got through the balloon's
surface and you can project
your fingers into the
cavity which is filled with air.
That is the peritoneal cavity.
We can divide the cavity into
a greater sac and a lesser sac.
And we can see the greater sac
here. You open up the abdomen
and the greater sac is what you see
when you get your hand into it.
If we lift up the greater
omentum like we have done
in previous occasions. We
lift up the greater omentum
we have a nicer view of the greater sac
where we can see the small intestines again.
We can see the ascending and descending
colon. So we can explore the greater sac.
If we flop the greater omentum
down and we lift up the liver
then we can see this
view which is the stomach
connected to the liver and here we can see
the lesser omentum this membrane here.
Now if we go to what's called the
free edge of this membrane
we can see we have got
a little aperture here.
And this is little foramen, this is a hole, and
this is the omental foramen or the epiploic foramen.
And this actually allows the greater
sac, which we can put a hand in
to communicate with a space that
is located behind the stomach.
That space is known
as the lesser sac.
And these two sacs are formed as the
stomach rotates during developments.
We can see then, we can communicate
the greater sac which is around
the small intestines, around the
large intestine we can communicate
with the lesser sac via
this omental foramen.
The greater sac can be further divided
into supracolic and infracolic compartment
just by looking at
the transverse colon.
And if we think below the transverse colon is
infacolic; so the small intestines, ascending, descending colon.
And if we think above the transverse colon, the
stomach, and liver and spleen is in the supracolic
compartment. We will
return to these later on.