21. Mucosa and Musculature of Small Intestine

Question 1

What is this organ?

Answer 1

Jejunum

Question 2

Identify 1 -> 2

Answer 2

1. Anastomotic loop (arcade) of jejunal arteries
2. Straight arteries (arteriae rectae)

Question 3

Identify 3 -> 5

Answer 3

3. Submucosa
4. Mucosa
5. Circular folds (valves of Kerckring)

Question 4

Identify 6

Answer 4

6. Mesentery

Question 5

What is this organ?

Answer 5

ileum

Question 6

3 parts of the small intestine with their peritoneal relations

Answer 6

1. The duodenum (secondarily retroperitoneal)
2. the jejunum (mesenteric)
3. the ileum (mesenteric)

Question 7

Identify 6 -> 7

Answer 7

6. Mesentery
7. Anastomotic loops (arcades) of ileal arteries

Question 8

Identify 8 -> 10

Answer 8

8. Serosa (visceral peritoneum)
9. Longitudinal smooth muscle layer
10. Circular smooth muscle layer

Question 9

Identify 11

Answer 9

11. Aggregate lymphoid nodules (Peyer’s patches)

Question 10

3 parts of the small intestine with their peritoneal relations

Answer 10

1. The duodenum (secondarily retroperitoneal)
2. the jejunum (mesenteric)
3. the ileum (mesenteric)

Question 11

The jejunum constitutes (1)___

the ileum constitutes (2)___

Answer 11

1. the proximal two-fifths
2. the distal three-fifths of the mesenteric small intestine.

Question 12

Several gross characteristics distinguish the jejunum from the ileum.

→ 4 characteristics

Answer 12

1. The jejunum is larger in diameter and has longer straight arteries branching from its arterial arcades.
2. The jejunum also has less fat in its mesentery and prominent circular folds of mucosa (plicae circulares) in its interior wall.
3. The jejunum is more distally in the small bowel
4. the concentration of The jejunum aggregated lymphoid nodules (Peyer’s patches) increases.