What is the function of the inferior mesenteric artery?
Inferior mesenteric artery
|Origin||Abdominal aorta at level of L3|
|Branches||Left colic, Sigmoid, Superior rectal arteries Contributes to the formation of the marginal artery of Drummond Mnemonic: Lesley Sings Songs|
|Supplies||Left third of transverse colon, descending colon, sigmoid colon, rectum|
Where is the inferior mesenteric artery?
The inferior mesenteric artery (IMA) is one of the three non-paired major splanchnic arteries, in the abdominal cavity, arising from the abdominal aorta and supplying the hindgut. It is the smallest of the three anterior visceral branches of the abdominal aorta.
What does the inferior mesenteric artery provide blood to?
Vascular supply The inferior mesenteric artery, also a branch of the abdominal aorta, supplies the distal third of the transverse colon, the descending colon and sigmoid colon, and the superior portion of the rectum as the superior hemorrhoidal artery.
What arises from inferior mesenteric artery?
In human anatomy, the inferior mesenteric artery, often abbreviated as IMA, is the third main branch of the abdominal aorta and arises at the level of L3, supplying the large intestine from the distal transverse colon to the upper part of the anal canal.
How do you identify an inferior mesenteric artery?
The inferior mesenteric artery (IMA) is another major blood supply to the lower GI tract (Fig. 25.4). It is located at the level of L2-L4 (most often at the L3-L4 disk space level, 2–3 cm above the aortic bifurcation). The IMA supplies the distal transverse colon, descending colon, sigmoid colon, and rectum.
What happens if inferior mesenteric artery is blocked?
In mesenteric ischemia, a blockage in an artery cuts off blood flow to a portion of the intestine. Mesenteric ischemia (mez-un-TER-ik is-KEE-me-uh) occurs when narrowed or blocked arteries restrict blood flow to your small intestine. Decreased blood flow can permanently damage the small intestine.
What does the SMA supply?
The superior mesenteric artery supplies the midgut from the ampullary region of the second part of the duodenum to the splenic flexure of the large intestine. The inferior pancreaticoduodenal artery arises from the SMA and, along with the superior pancreaticoduodenal artery, supplies the head of the pancreas.
What artery supplies the stomach?
The celiac artery gives rise to three major branches, including the left gastric, splenic, and common hepatic arteries. Collectively, these major branches of the celiac artery supply the stomach, spleen, liver, gallbladder, abdominal esophagus, pancreas, and duodenum.
What does the SMA supply blood to?
What is superior mesenteric artery syndrome?
Superior mesenteric artery syndrome is caused when the third part of the duodenum is trapped or compressed between the two arteries – the aorta and the superior mesenteric artery. The intestine is a long, winding tube that connects the stomach to the anus. There is a small intestine and a large intestine.
Where does the inferior mesenteric artery supply the midgut?
The superior mesenteric artery supplies the midgut and the inferior mesenteric artery supplies the hindgut. Each of these arteries give off major branches that supply regions of the gastrointestinal tract. The inferior mesenteric artery arises from the abdominal aorta at the level of the third lumbar vertebra,…
What causes the narrowing of the superior mesenteric artery?
Superior mesenteric artery syndrome is described as the loss of the intervening mesenteric fat pad (fatty tissue that surrounds the superior mesenteric artery) between the aorta and superior mesenteric artery, leading to narrowing of the angle between the two vessels, which in turn causes compression of the third portion of the duodenum 2).
Where does the colic branch of the mesenteric artery run?
The colic branch runs superiorly and supplies the ascending colon. Jejunal and Ileal branches – These arteries branch off from the left side of the superior mesenteric artery to supply the jejunum and ileum. They form arterial arcades (a network of arteries that lies near the bowel and supplies it).
What are the risk factors for acute mesenteric ischaemia?
Acute mesenteric ischaemia commonly results from an embolus that becomes lodged in any of the branches of the mesenteric arteries. Risk factors include atrial fibrillation, chronic renal failure and heart failure. Treatment includes surgical revascularization, but radiological interventions are being developed.