Small Intestine: Jejunum & Ileum

Question 1

Length of jejunum & ileum

Answer 1

6 meters (20 feet)

Question 1

Compare between lengths & content of jejunum & ileum

Answer 1

• Jejunum: 2.4 meters, usually empty
• Ileum: 3.6 meters, contains food

Question 2

Compare between sites of jejunum & ileum

Answer 2

• Jejunum: umbilical region
• Ileum: hypogastrium & right iliac fossa

Question 3

Compare between walls of jejunum & Ileum

Answer 3

• Jejunum: thick wall & wide lumen (for parestalisis & absorption)
• Ileum: Thin wall & narrow lumen

Question 4

Compare between vascularity of jejunum & Ileum

Answer 4

• Jejunum: more vascular & bright red
• Ileum: less vascular & paler

Question 5

Compare between lymphatics of jejunum & ileum

Answer 5

• Jejunum: less lymphatic vessels & nodes
• Ileum: more lymphatic vessels & nodes with peyer’s patches

Question 6

Compare between Arterial Arcades of jejunum & Ileum

Answer 6

• Jejunal A: less complicated arcades (1-2)
• Ileal A: more complicated arcades (3-4)

Question 7

Compare between fat in mesentery surrounding jejunum & ileum

Answer 7

• Jejunum: small amounts of fat & clear mesentery
• Ileum: large amount of fat & not clear mesentery

Question 8

Arterial supply of jejunum & ileum

Answer 8

Jejunal & ileal Arteries (from sup. mesenteric A)

Question 9

Contents of Small intestine mesentery

Answer 9

1. Small intestines (in free border)
2. Lymph vessels (lacteals) carrying Chyle (lymph milky in appearance)
3. Sup. mesenteric vessels
4. mesenteric Lymph nodes
5. Sympthetic & parasympathetic plexuses
6. Extraperitoneal fat

Question 10

Root of Small intestine mesentery crosses over

Answer 10

1. 3rd part duodenum
2. Abdominal Aorta
3. IVC
4. Right psoas major
5. right ureter
6. right genitofemoral N
7. right gonadal A