Gastrointestinal blood supply

Arterial supply:

Thoracic aorta

• Oesophageal branches

Coeliac trunk

• Left gastric
• Splenic \(to\) left gastroepiploic
• Common hepatic \(to\) proper hepatic, right gastric, gastroduodenal \(to\) right gastroepiploic + superior pancreaticoduodenal

Superior mesenteric artery:

• Inferior pancreaticoduodenal
• intestinal branches
• right and middle colic arteries

Inferior mesenteric:

• left colic
• sigmoid
• superior rectal

Internal iliac

• middle rectal

Coeliac trunk supplies:

Abdominal oesophagus

Stomach

Spleen

Liver

Superior half of pancreas + duodenum

SMA supplies:

Inferior half of pancreas + duodenum

All of jejunum and ileum

Colon to splenic flexure

IMA supplies:

Colon from splenic flexure

Venous drainage (portal):

• Superior + inferior mesenteric vein, join to become
• Portal vein, drains via liver to
• IVC

Other venous drainage:

• Oesophagus drained by azygous
• Lower rectum and anus by middle rectal vein \(\to\) IVC