GI Blood Supply

Question 1

At what level do each of the main branches come off the abdominal aorta?

Answer 1

Celiac - T12/L1

SMA - L1

IMA - L3

Question 2

Branches of Celiac Trunk

Answer 2

L gastric –> L gastric and esophageal branches

Splenic –> splenic artery, short gastric branches go up while L gastroepiploic goes down

Common Hepatic - R gastric, Gastroduodenal and Proper Hepatic

Question 3

Branches of Proper Hepatic Artery

Answer 3

R hepatic, L hepatic and cystic arteries

Question 4

Branches of gastroduodenal Artery

Answer 4

R gastroepiploic

Anterior and Posterior superior pancreaticoduodenal

Question 5

General Supply by Celiac, SMA and IMA

Answer 5

Celiac - pharynx, lower esophagus to proximal duodenum + liver, gallbladder, pancreas and spleen

SMA - Distal duodenum to proximal 2/3 transverse colon

IMA - distal 1/3 transverse colon to upper rectum (above pectinate line)

Question 6

What vessel would a posterior duodenal ulcer affect?

Answer 6

Gastroduodenal

Question 7

3 Major Porto-Systemic Anastomoses

Answer 7

1- L gastric to azygous (esophageal varices)

2- Paraumbilical to small epigastric veins of anterior abdominal wall (caput medusa)

3- Superior rectal to middle and inferior rectal (anorectal varices)