The superior mesenteric artery (SMA) and the inferior mesenteric artery (IMA) provide blood supply to the colon. Communication between these two vessels happens via the marginal artery, which runs parallel to the length of the entire colon.
Aorta. The aorta is the major artery that is directly connected to the heart via the left ventricle. Due to its connection to the heart (a strong muscular pump), this artery experiences the most pressure. Through the aorta, the rest of the arteries of the body are able to obtain blood.
The venous drainage of the colon is similar to the arterial supply: Ascending colon – ileocolic and right colic veins, which empty into the superior mesenteric vein. Transverse colon – middle colic vein, which empties into the superior mesenteric vein.
The abdominal aorta forms several branches, three of which supply blood to the intestines: the celiac trunk, superior mesenteric artery, and inferior mesenteric artery. Each of these arteries forms many smaller branches that spread throughout the abdomen to specific regions of the intestines.
The vagus nerve (CNX) enters the abdominal cavity via the oesophageal hiatus of the diaphragm to provide parasympathetic innervation to the large intestines. The pelvic splanchnic nerves (S2-4) also contribute to the large intestines' parasympathetic supply.
The large intestine is primarily supplied by the right colic artery, middle colic artery, and left colic artery. They do not supply the duodenum of the small intestine. The duodenum is primarily supplied by the inferior pancreaticoduodenal artery and superior pancreaticoduodenal artery.
Blood supply
Arterial supply to the colon comes from branches of the superior mesenteric artery (SMA) and inferior mesenteric artery (IMA). Flow between these two systems communicates via the marginal artery of the colon that runs parallel to the colon for its entire length.
The superior mesenteric artery (SMA) and the inferior mesenteric artery (IMA) provide blood supply to the colon. Communication between these two vessels happens via the marginal artery, which runs parallel to the length of the entire colon.
The celiac trunk supplies blood to the stomach, and the superior and inferior mesenteric arteries supply the small intestine, the proximal colon and distal colon, respectively. These arteries further divide into arterioles extending to the tip of each individual villus.
The celiac trunk is the principal (but not exclusive) artery supplying the foregut. The celiac trunk arises from the abdominal aorta.
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