Greater Omentum Flashcards

Explore the greater omentum, its peritoneal layers, gastric and colonic attachments, vascular supply, embryology, and protective functions.

Card 1 of 30Question

What is the greater omentum?

A large, apron-like fold of peritoneum that hangs from the stomach and covers much of the abdominal viscera.

In This Section

1. What is the greater omentum?

A large, apron-like fold of peritoneum that hangs from the stomach and covers much of the abdominal viscera.

2. From which part of the stomach does the greater omentum primarily arise?

The greater curvature of the stomach.

3. Which part of the duodenum also provides an attachment for the greater omentum?

The proximal portion of the superior, or first, part of the duodenum.

4. How many peritoneal layers traditionally form the greater omentum?

Four layers, formed by two descending and two ascending peritoneal sheets that usually fuse.

5. How are the four layers of the greater omentum arranged during development?

Two layers descend from the stomach, fold upward, and return toward the transverse colon.

6. From which embryological mesentery does the greater omentum develop?

The dorsal mesogastrium.

7. What developmental process causes the greater omentum to hang over the intestines?

Elongation of the dorsal mesogastrium during stomach rotation and abdominal development.

8. Which portion of the greater omentum connects the stomach to the transverse colon?

The gastrocolic ligament.

9. What is the relationship between the greater omentum and transverse mesocolon?

The ascending omental layers normally fuse with the transverse mesocolon.

10. Which abdominal structures are covered anteriorly by the free portion of the greater omentum?

Much of the small intestine and portions of the colon.

11. What is the relationship between the greater omentum and lesser sac during development?

The developing greater omentum contains an inferior extension of the lesser sac that usually becomes obliterated.

12. Which two named arteries run along the greater curvature within the greater omentum?

The right and left gastro-omental arteries.

13. From which artery does the right gastro-omental artery usually arise?

The gastroduodenal artery.

14. From which artery does the left gastro-omental artery usually arise?

The splenic artery.

15. What arterial connection is formed along the greater curvature of the stomach?

An anastomosis between the right and left gastro-omental arteries.

16. Where does the right gastro-omental vein typically drain?

Into the superior mesenteric vein, often through the gastrocolic trunk.

17. Where does the left gastro-omental vein typically drain?

Into the splenic vein.

18. Which lymph nodes receive lymph from the greater omentum near the greater curvature?

The right and left gastro-omental lymph nodes.

19. What types of tissue are abundant between the peritoneal layers of the greater omentum?

Adipose tissue, loose connective tissue, blood vessels, lymphatics, and immune cells.

20. What are milky spots in the greater omentum?

Small immune cell aggregates involved in peritoneal immune surveillance.

21. Which immune cells are particularly prominent within omental milky spots?

Macrophages, B lymphocytes, and T lymphocytes.

22. Why is the greater omentum sometimes called the policeman of the abdomen?

It can migrate toward inflamed areas and adhere to them, helping contain infection.

23. How does the greater omentum help limit the spread of intra-abdominal infection?

It adheres to inflamed tissues and can help isolate localized inflammatory processes.

24. What is the principal metabolic role of adipose tissue within the greater omentum?

Energy storage and secretion of adipose-derived signaling molecules.

25. What is an omental flap?

A surgically mobilized segment of vascularized omentum used to cover or reinforce tissues.

26. Why is the greater omentum useful in reconstructive surgery?

Its mobility, vascular supply, and immune properties make it useful for supporting tissue repair.

27. What is an omentectomy?

Surgical removal of part or all of the omentum.

28. What is omental caking?

Diffuse thickening and infiltration of the omentum, commonly associated with peritoneal malignancy.

29. Which part of the greater omentum is commonly divided to enter the lesser sac surgically?

The gastrocolic ligament.

30. Why must gastro-omental vessels be identified during division of the gastrocolic ligament?

To prevent vascular injury and preserve the gastric blood supply when required.