10. GI blood supply and innervation Flashcards Preview

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Flashcards in 10. GI blood supply and innervation Deck (17)

embryonic gut region blood supply and parasympathetic innervation

1. foregut --> celiac artery ( except pharync and most of the esophagus ) and vagus
2. Mid gut --> SMA and vagus
3. Hindgut --> IMA and pelvic


foregut --> celiac artery and vagus - structures supplied

phaarynx ( vagus nerve only ) and lower esophagus ( celiac artery only) to proximal duodenum, liver gallbladder, pancreases , spleen ( mesoderm)


Midgut --> SMA and vagus - structures supplierd

distal duodenum to proxial 2/3 of transverse colon


Hindgut -> IMA and pelvic - structures supplied

distal 1/3 transverse colon to upper portion of rectum


pharynx - arteries

ascending pharyngeal artery, ascending palatine , descending palatine, pharyngeal branches of inferior thyroid


esoophageal - arteries

esophageal branches of inferior thyroid artery ( top third)
esophageal branches of thoracic part of aorta ( middle third)
esophageal branches of left gastric artery ( bottom third)


• An 80-year-old has a colonoscopy revealing necrotic mucosa at the splenic flexure. Which arteries branching from the aorta supply this area?

The superior and inferior mesenteric arteries (the splenic flexure is the watershed area between them)


• What are the three embryologic divisions of the gastrointestinal tract?

The foregut, midgut, and hindgut


• A man with severe abdominal pain has an exploratory laparotomy revealing necrosis of foregut structures. Which artery was likely affected?

The celiac artery


• After an abdominal aortic aneurysm repair, a patient is found to have necrotic large bowel. Which artery was likely compromised?

The inferior mesenteric artery


• The foregut and midgut get their parasympathetic innervation from this nerve.

Vagus nerve


• The hindgut gets its parasympathetic innervation from this nerve.

Pelvic nerve


• What portion of the gastrointestinal tract is derived from the embryonic midgut?

The distal duodenum to the proximal two thirds of the transverse colon


• What portion of the gastrointestinal tract is derived from the embryonic hindgut?

The distal third of the transverse colon to the upper rectum


• What organ supplied by the celiac trunk is not an embryonic gut derivative?



• A patient recently underwent a vagotomy. Which segments of her GI tract would be expected to lack parasympathetic innervation?

The foregut and midgut


• A diabetic patient is hoarse and complains of dysphagia from vagal nerve damage. What part of the gut still has parasympathetic innervation?

Hindgut (the vagus nerve innervates the foregut and midgut, and the pelvic nerve innervates the hindgut)

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