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Superior rectal artery: want to learn more about it?

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Superior rectal artery

Superior rectal artery (Arteria rectalis superior)

The superior rectal artery (superior hemorrhoidal artery) is a direct pelvic continuation of the inferior mesenteric artery. The superior rectal artery arises when the inferior mesenteric artery passes the pelvic brim (the edge of the pelvic inlet).

The superior rectal artery runs in the mesorectum and terminates by dividing into two terminal branches. These branches descend across the sides of the rectum, providing supply for its superior two-thirds.

Key facts about the superior rectal artery
Origin Inferior mesenteric artery
Branches Two unnamed terminal branches (Left and Right)
Supply Upper two this of the rectum

This article will discuss the anatomy and function of the superior rectal artery.

Course

The superior rectal artery arises from the inferior mesenteric artery as its continuation crosses over the left common iliac vessels and below the pelvic brim. The superior rectal artery continues its course in the inferomedial direction, towards the midline. At the level of the third sacral vertebra in the midline, it enters the mesorectum and divides into two terminal branches. On its path through the mesorectum (the fat tissue surrounding the rectum) the artery is accompanied by the same-named vein and its tributaries. The artery terminates by dividing into two (or more) terminal branches.

Branches and supply

The superior rectal artery usually gives off two terminal branches that descend across both (left and right) sides of the rectum. The right branch is usually larger in diameter and often provides a branch for the posterior aspect of the rectum. Both branches traverse the outer layer of the rectal wall and reach the submucosa. They provide abundant blood supply for the major part of the rectum, as far inferiorly as the internal anal sphincter. In the submucosal layer, the terminal branches form an anastomotic network with the branches of the middle rectal and inferior rectal arteries.

Learn more about the blood vessels of the rectum with our articles, videos, labeled diagrams and quizzes.

Anatomical variations

In approximately 10% of cases, the superior rectal artery ends in a trifurcation, providing three terminal branches.

Superior rectal artery: want to learn more about it?

Our engaging videos, interactive quizzes, in-depth articles and HD atlas are here to get you top results faster.

What do you prefer to learn with?

“I would honestly say that Kenhub cut my study time in half.” – Read more. Kim Bengochea Kim Bengochea, Regis University, Denver

Show references

References:

  • Moore, K. L., Dalley, A. F., & Agur, A. M. R. (2014). Clinically Oriented Anatomy (7th ed.). Philadelphia, PA: Lippincott Williams & Wilkins.
  • Netter, F. (2019). Atlas of Human Anatomy (7th ed.). Philadelphia, PA: Saunders.
  • Standring, S. (2016). Gray's Anatomy (41tst ed.). Edinburgh: Elsevier Churchill Livingstone.
  • Tubbs, R. S., Shoja, M. M., Loukas, M., & Bergman, R. A. (2016). Bergman’s comprehensive encyclopedia of human anatomic variation. Hoboken: Wiley Blackwell.

Illustrations:

  • Superior rectal artery (Arteria rectalis superior) - Begoña Rodriguez
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