USMLE Step 1 Review 04 06 Anatomy Blood Supply to Large Intestine 1

USMLE Step 1 Review 04 06 Anatomy Blood Supply to Large Intestine 1

 

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Begin 04 06 Anatomy Blood Supply to Large Intestine 1 Transcription

What arteries supply the cecum?

  • The anterior and posterior cecal arteries.

And where do they come from?

  • The ileocolic artery.

And where does the ileocolic artery originate?

  • The superior mesenteric artery.

Origin?

  • Abdominal aorta.

At what level?

  • The superior mesenteric arises from the abdominal aorta at the level of L1.

What vessels supply the appendix?

  • The appendicular artery and vein.

How do these vessels run to supply the appendix?

  • Through the mesoappendix.

And from what does the appendicular artery arise from?

  • The ileocolic artery.

And where does the ileocolic artery arise?

  • The superior mesenteric artery.

What artery supplies the bottom portion of the ascending colon?

  • The ascending colic artery.

And where does the ascending colic artery come from?

  • The ileocolic artery.

And again, the origin of the ileocolic?

  • The superior mesenteric artery.

What artery supplies the rest of the ascending colon, the upper two-thirds?

  • The right colic artery.

And where does the right colic artery come from?

  • Directly from the superior mesenteric artery.

What artery supplies the right two-thirds of the transverse colon?

  • The middle colic artery.

And where does the middle colic artery come from?

  • From the superior mesenteric artery. Okay, let’s put this all together. The superior mesenteric artery coming from the abdominal aorta supplies branches to both the small intestines and parts of the large intestine.

What four parts of the large intestine are supplied by branches from the superior mesenteric artery?

  • Cecum, appendix, ascending colon, and the right two-thirds of the transverse colon.

Again, four parts of large intestines supplied by branches from the superior mesenteric artery?

  • Cecum, appendix, ascending colon, right two-thirds of the transverse colon.

What are the three main branches from the superior mesenteric artery supplying parts of the large intestine from the most distal part of the large intestine supplied to the most proximal part?

  • Middle colic, right colic, and the ileocolic.

Now the middle colic supplies what part?

  • The right two-thirds of the transverse colon.

And the right colic supplies?

  • The ascending colon except for the bottom near the cecum.

The ileocolic artery supplies both small intestine and parts of the large intestine through branches.

What parts of the large intestine are supplied by branches from the ileocolic artery?

  • Cecum, appendix, and the bottom of the ascending colon.

What is the branch from the ileocolic to the bottom of the ascending colon?

  • The ascending colic artery.

And what are the branches from the ileocolic to the cecum?

  • The anterior and posterior cecal arteries.

And what is the branch from the ileocolic to the appendix?

  • The appendicular artery.

****END OF TRANSCRIPTION****

 

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