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Superior Mesenteric Artery – Arterial Supply to the GI Tract

by James Pickering, PhD
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    00:01 Now let's move on to the superior mesenteric artery. Superior mesenteric artery supplying the midgut.

    00:06 The midgut going from the distal half of the duodenum, so all structures distal to the major duodenal papilla.

    00:14 And it includes the jejunum, the ileum, the caecum (appendix), ascending colon and the proximal 2/3rd of the transverse colon. And we can see the superior mesenteric artery here, around about L1, is giving rise to a series of jejunal arteries and ileal arteries that pass within the mesentery towards the jejunum and the ileum.

    00:37 It carries on in this direction alongside the roots of the mesentery and passes to the lower right quadrant. As it approaches the lower right quadrant it then gives rise to ileocolic arteries. Ileocolic arteries that go and supply the appendix.

    00:53 And also a right colic artery and a middle colic artery The middle colic artery is important because that passes up and that contributes to this marginal artery, which we will come back to in a moment. And that runs along the inside of the transverse colon. And these colic arteries feed into it, the middle colic, specifically.

    01:16 We also have the inferior pancreaticoduodenal artery. And we spoke about that when we looked at the arterial supply to the foregut.

    01:25 So we have got superior mesenteric artery, gives branches to the jejunum, gives branches to the ileum.

    01:31 It gives branches to the ileocecal junction, so to the distal part of the ileum, to the caecum and we will also find it up the appendicular branch there as well. We then have a right colic artery and we have a middle colic artery. And these will give branches to the marginal artery. And this runs along the inside parallely most of the transverse colon and then it drifts down, as we see, the inferior mesentery artery into the descending colon. And we have got the inferior pancreaticoduodenal that we have spoken about.

    02:05 So the midgut extending from the distal half of the duodenum to the proximal 2/3rd of the transverse colon. That stretch of the GI tract is supplied by superior mesenteric.


    About the Lecture

    The lecture Superior Mesenteric Artery – Arterial Supply to the GI Tract by James Pickering, PhD is from the course Abdomen.


    Included Quiz Questions

    1. Distal 1/3rd of transverse colon.
    2. Jejunum.
    3. Ileum.
    4. Appendix.
    5. Ascending colon.

    Author of lecture Superior Mesenteric Artery – Arterial Supply to the GI Tract

     James Pickering, PhD

    James Pickering, PhD


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