Inferior Mesenteric Artery

by James Pickering, PhD

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    00:01 Now let's have a look at the inferior mesenteric artery.

    00:05 The inferior mesenteric artery, again, if we zoom into have a look at the abdominal aorta is going to come off the abdominal aorta around about the third lumbar vertebral level.

    00:16 And here we can see it's mostly going to supply the hindgut.

    00:19 So that's part from the distal third of the transverse colon up to the splenic flexure, descending colon, sigmoid colon, and then part of the rectum.

    00:29 We can see here we have the left colic artery, which is going to give an ascending branch that goes up and becomes associated with the marginal artery.

    00:37 We'll see again in a moment.

    00:39 Ascending branch coming from the left colic, we also have a descending branch, and that's going to unite with the sigmoid artery that's going to supply the sigmoid part of the colon.

    00:49 We can see again, have we have more poorly formed but still some arterial arcades in this region.

    00:56 The final terminal branch of the inferior mesenteric artery is that one that's passing down to the rectum, and this is the superior rectal artery.

    01:05 As its name suggests, we may have inferior or even middle versions of this artery.

    01:11 Let's go back to the marginal artery.

    01:13 We saw it associated with the superior mesenteric artery.

    01:17 And now we can see the ascending branch of the left colic running up to help supply that transition between the midgut and the hindgut.

    01:26 And also we can see those vasa recta coming off all of them those straight arteries to supply the substance of the large intestine itself.

    01:35 So this is that important transition between the midgut and the hindgut.

    01:39 Here we have the superior mesenteric artery giving rise to the middle colic, is giving rise to the marginal artery that's now running around the transverse colon.

    01:48 It's going to unite form an anastomosis with the ascending branch of the left colic artery, which is coming from the inferior mesenteric.

    01:57 And here we have that anastomosis between the superior and inferior mesenteric arteries.

    02:03 It typically happens around the splenic flexure.

    02:06 That's typically the area where this transition, these anastomosis occur.

    02:11 So now let's have a look down at the rectum and we spoke about the superior rectal artery going to supply the rectum.

    02:18 Here we have the superior rectal artery coming from the inferior mesenteric artery.

    02:23 We also have the middle rectal artery, and we have an inferior rectal artery.

    02:28 These two arteries supply the middle and the inferior aspect of the rectum.

    02:33 And they come from arteries, which we haven't really touched on before.

    02:36 But for completion, the middle rectal arteries coming from the internal iliac.

    02:41 The internal iliac is formed from the bifurcation of the common iliac.

    02:45 And remember, the common iliac was the bifurcation of the aorta as it entered into the pelvis.

    02:52 Coming off the internal pudendal artery is the inferior rectal artery and this supplies the lower portion of the rectum.

    02:59 The internal pudendal artery is a branch again coming from the internal iliac artery.

    03:05 The internal pudendal artery goes on to supply other structures which we can discuss another time.

    03:12 So here we have that overview again from the inferior mesenteric artery.

    03:17 Gives rise to the left colic.

    03:18 We can anastomosed with the middle colic artery from coming from the superior mesenteric artery.

    03:25 And the connection between the left colic and the middle colic is that marginal artery.

    03:30 The left colic also gives rise to sigmoid arteries and the superior rectal artery that go and supply the rectum.

    03:37 The sigmoid arteries goes to supply the sigmoid colon.

    03:40 Importantly, the superior rectal artery will anastomosed with both the middle rectal and the inferior rectal to supply the rectum.

    About the Lecture

    The lecture Inferior Mesenteric Artery by James Pickering, PhD is from the course Vascular Supply of the Abdomen.

    Included Quiz Questions

    1. Marginal
    2. Sigmoidal
    3. Superior rectal
    4. Inferior rectal
    5. Ileocolic
    1. L3
    2. L1
    3. L2
    4. T12
    5. T10
    1. Superior rectal
    2. Inferior rectal
    3. Left colic
    4. Middle colic
    5. Ileocolic

    Author of lecture Inferior Mesenteric Artery

     James Pickering, PhD

    James Pickering, PhD

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