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So let's look at some important anatomic structures that

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we should be aware of.

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When it comes to the non visceral structures of the abdomen, we

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need to be aware of the peritoneum.

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We need to be aware of the mesentery as

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well as domantum key components of the peritoneum as

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well as the Retro peritoneum. These are the two

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sites that were focused on in our discussion today.

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So what about the peritoneum?

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This includes in really is comprised of the

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mesodermal double layered serous membrane that

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lines organs of the abdomen. We have the parietal peritoneum.

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That's really directly opposed to

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the abdominal wall. So imagine outwardly facing conversely to

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the visceral peritoneum, which is inwardly facing

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directly opposed to the viscera.

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Between these regions there's secretion of peritoneal fluid

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to lubricate organs.

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And it gives rise to mesentery and omentum

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as we would have mentioned previously which sort of served einkan protect

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the visceral.

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And then we have the neurovascular anatomy within the

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peritoneum. We have the parietal peritoneum that

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also has important arterial venous and

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nervous structures in the case of the arterial. We have the abdominal

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wall vasculature, which the emperor gastric arteries are of

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note. We have the abdominal a order which is more posteriorly

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and then the venous drainage which includes

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the IVC for example important structure to

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be mindful of and then we have the somatic innervation which is

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important as it relates to the parietal peritoneum, which

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is really shared with the adjacent Domino pelvic wall.

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So when we think of the peritoneal spaces, it's important to note that

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this.

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Peritoneal cavity is the potential space

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between the visceral and the parietal

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peritoneum. So it's divided actually into sacs

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and subspaces that are particularly important for us

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to know when we think of the majority of the peritoneal cavity

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from the diaphragm to the pelvis. We're thinking about

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the greater sac and that includes sort of an infra and

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supercolic compartments and they communicate via

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gutters. We aware of

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the park call it gutters or sort of the little guttural highways on

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either side of the abdomen.

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We're also aware of the Lesser sack the mental Bursa

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which we see in this region right here.

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And that is a region of the peritoneal cavity just posterior to the

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stomach and the less romantic.

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So why is this important? It's important for a number

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of reasons, but when it comes to dissemination of disease, for example, if you

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have fluid in the abdomen, there's malignancy,

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for example, right this fluid this

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is going to sort of wash malignancy or

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infection and spread by the flow of

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peritoneal fluid via the various compartments.

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So this proclivity to spread is

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really via the connectivity of each of

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the compartments which is important for us to know. So the more dependent portions

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gravity dependent portions of the protein of

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cavity IE directive ethical space are going

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to be sites where we tend to see sort of pooling and stasis of

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fluid and just sites that are more

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likely to collect infection or

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malignant cells if there's fluid in the abdomen