Opened Abdomen View – Peritoneum

by James Pickering, PhD

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    00:00 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.

    00:10 So here we have an opened abdomen. We have the peritoneal cavity has been exposed.

    00:18 Now here we can see the flaps of the anterior abdominal wall.

    00:22 Now lining this surface will be parietal peritoneum will be parietal peritoneum.

    00:31 Tightly associated with the organs with the visceral peritoneum.

    00:35 And if it's not visceral peritoneum, it's going to be parietal peritoneum running on the posterior abdominal wall.

    00:42 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.

    00:56 So there is nothing actually within the peritoneal cavity except a thin serous fluid.

    01:04 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.

    01:23 That is the peritoneal cavity.

    01:26 We can divide the cavity into a greater sac and a lesser sac.

    01:29 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.

    01:36 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.

    01:48 We can see the ascending and descending colon. So we can explore the greater sac.

    01:55 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.

    02:08 Now if we go to what's called the free edge of this membrane we can see we have got a little aperture here.

    02:16 And this is little foramen, this is a hole, and this is the omental foramen or the epiploic foramen.

    02:23 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.

    02:34 That space is known as the lesser sac.

    02:38 And these two sacs are formed as the stomach rotates during developments.

    02:43 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.

    02:57 The greater sac can be further divided into supracolic and infracolic compartment just by looking at the transverse colon.

    03:05 And if we think below the transverse colon is infacolic; so the small intestines, ascending, descending colon.

    03:11 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.

    About the Lecture

    The lecture Opened Abdomen View – Peritoneum by James Pickering, PhD is from the course Abdomen.

    Included Quiz Questions

    1. Epiploic (omental) foramen
    2. Foramen of Morgagni
    3. Foramen rotundum
    4. Foramen ovale
    5. Apical foramen

    Author of lecture Opened Abdomen View – Peritoneum

     James Pickering, PhD

    James Pickering, PhD

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