Middle colic artery

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Middle colic artery
Gray537.png
The superior mesenteric artery and its branches. (Middle colic visible at center top.)
Colonic blood supply.svg
Colonic blood supply (Middle colic artery is #6)
Details
Source Superior mesenteric artery
Vein Middle colic vein
Supplies Transverse colon
Identifiers
Latin arteria colica media
TA98 A12.2.12.067
TA2 4265
FMA 14810
Anatomical terminology

The middle colic artery is an artery of the abdomen; a branch of the superior mesenteric artery distributed to parts of the ascending and transverse colon. It usually divides into two terminal branches - a left one and a right one - which go on to form anastomoses with the left colic artery, and right colic artery (respectively), thus participating in the formation of the marginal artery of the colon.

Contents

Parts of the artery may be removed in different types of hemicolectomy.

Structure

The middle colic artery supplies the superior/distal part of the ascending colon and right/proximal two-thirds of the transverse colon. [1]

Origin

The middle colic artery is a branch of the superior mesenteric artery, branching off from its right aspect. Its origin is situated just inferior the neck of the pancreas. It may share a common origin with the right colic artery. [2]

Course

The middle colic artery passes anterosuperiorly between the layers of the transverse mesocolon just right of the midline before dividing into left and right terminal branches. [2]

Branches and anastomoses

The anastomotic arches formed by the left and right branches of the middle colic artery are about two fingers' breadth from the transverse colon, to which they distribute branches. [3]

The sequence of anastomoses of the branches of the middle colic artery constitutes part of the marginal artery of the colon. [1]

Left branch

The left branch anastomoses with a branch of the left colic artery (in turn a branch of the inferior mesenteric artery [4] ) near the left colic flexure, [2] forming the arc of Riolan. [4]

Right branch

The right branch anastomoses with the ascending branch of the right colic artery. [2]

Variation

Alternate origin

The middle colic artery may rarely instead arise from the abdominal aorta, inferior mesenteric artery, dorsal pancreatic artery, hepatic artery proper, left colic artery, [2] or splenic artery.

Accessory middle colic artery

An accessory middle colic artery in encountered in 10-20% of individuals. [4] The accessory artery may arise from the superior mesenteric artery proximal to the middle colic artery proper, and from the abdominal aorta, inferior mesenteric artery, dorsal pancreatic artery, hepatic artery proper, or left colic artery. [2] An accessory middle colic directly originated from the superior mesenteric artery occurred in 18% of individuals. [5]

Number of terminal branches

The middle colic artery may occasionally divide into 3 or more branches (in which case the two lateral-most branches are the ones forming the anastomoses). [2]

Clinical significance

In a right hemicolectomy to remove the caecum and the ascending colon, the right branch of the middle colic artery is ligated and removed. [1] [6] In a transverse hemicolectomy, the entire middle colic artery may need to be ligated and removed. [6]

See also

Related Research Articles

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<span class="mw-page-title-main">Superior mesenteric artery</span> Artery which supplies blood to the intestines and pancreas

In human anatomy, the superior mesenteric artery (SMA) is an artery which arises from the anterior surface of the abdominal aorta, just inferior to the origin of the celiac trunk, and supplies blood to the intestine from the lower part of the duodenum through two-thirds of the transverse colon, as well as the pancreas.

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References

  1. 1 2 3 Jacob, S. (2008). "4 - Abdomen". Human Anatomy. Churchill Livingstone. pp. 71–123. doi:10.1016/B978-0-443-10373-5.50007-5. ISBN   978-0-443-10373-5.
  2. 1 2 3 4 5 6 7 Standring, Susan (2020). Gray's Anatomy: The Anatomical Basis of Clinical Practice (42nd ed.). New York. p. 1193. ISBN   978-0-7020-7707-4. OCLC   1201341621.{{cite book}}: CS1 maint: location missing publisher (link)
  3. ↑ Gray, Henry (1918). Gray's Anatomy (20th ed.). p. 609.
  4. 1 2 3 Mazzucchelli, Luca; Maurer, Christoph (2004). "Colon, Anatomy". Encyclopedia of Gastroenterology. Academic Press. pp. 408–412. doi:10.1016/B0-12-386860-2/00147-7. ISBN   978-0-12-386860-2.
  5. ↑ Zou, Jiaxin; Jiang, Xiaofeng; Feng, Jubin; Cai, Jiawei; Kong, Decan; Cao, Wuteng; Zhao, Hengyu; Zhu, Dongyun; Meng, Xiaochun; Ke, Jia (2022-03-01). "Anatomical variations of the branches from left colic artery and middle colic artery at splenic flexure". Surgical and Radiologic Anatomy. 44 (3): 467–473. doi:10.1007/s00276-022-02898-8. ISSN   1279-8517. PMID   35230505. S2CID   247160576.
  6. 1 2 Ramsanahie, Anthony; Bleday, Ronald (2004). "Colectomy". Encyclopedia of Gastroenterology. Academic Press. pp. 366–371. doi:10.1016/B0-12-386860-2/00140-4. ISBN   978-0-12-386860-2.
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