Which arterial anastomosis is called the Arc of Riolan?

Which arterial anastomosis is called the Arc of Riolan?

The arc of Riolan, also known as the mesenteric meandering artery (of Moskowitz) or central anastomotic mesenteric artery, is an arterioarterial anastomosis between the superior and inferior mesenteric arteries.

What is root of mesentery?

The root of the mesentery, or root of the small bowel mesentery to be exact, is the origin of the mesentery of the small intestine (i.e. jejunum and ileum) from the posterior parietal peritoneum, attached to the posterior abdominal wall.

Where does the marginal artery of Drummond come from?

The marginal artery of Drummond is formed by the anastomotic branches of the ileocolic, right colic, and middle colic artery, that arise from the superior mesenteric artery; and branches of the left colic and sigmoid arteries, which arise from the inferior mesenteric artery.

What does the marginal artery connect?

Structure. The marginal artery runs in the mesentery close to the large intestine as part of the vascular arcade that connects the superior mesenteric artery and the inferior mesenteric artery. It provides an effective anastomosis between these two arteries for the large intestine.

What is the mesenteric vein?

The superior mesenteric vein (SMV) is a large blood vessel in the abdomen. Its function is to drain blood from the small intestine as well as the first sections of the large intestine and other digestive organs. This large vein receives blood from several other veins (tributaries) in the digestive tract.

What is marginal artery of Drummond?

The marginal artery of Drummond, also known as the marginal artery of the colon, is a continuous arterial circle or arcade along the inner border of the colon formed by the anastomoses of the terminal branches of the superior mesenteric artery (SMA) and inferior mesenteric artery (IMA).

What’s a mesentery?

The mesentery is a fold of membrane that attaches the intestine to the abdominal wall and holds it in place. Mesenteric lymphadenitis is an inflammation of the lymph nodes in the mesentery.

What is omentum and mesentery?

Definition. Omentum refers to a fold of peritoneum, connecting the stomach with other abdominal organs while mesentery refers to a fold of the peritoneum, which attaches the stomach, small intestine, pancreas, spleen, and other organs to the posterior wall of the abdomen.

What is the importance of the marginal artery of Drummond?

Background. The marginal artery of Drummond (MA) is an anatomically variable blood vessel that forms a major anastomotic network between the superior and inferior mesenteric arteries. It vascularizes the transverse and descending colons and is a major contributor to the collateral circulation of left-colic structures.

Why is it called the marginal artery?

History and etymology. The marginal artery of Drummond is named after British pathologist and anatomist Sir David Drummond (1852–1932) who found that even though the three main colic arteries were surgically tied off, contrast medium injected into the ileocolic artery still passed to the sigmoidal branches 4,5.

Why is the marginal artery important?

Gross anatomy The marginal artery is an important connection between the SMA and IMA providing collateral flow in the event of occlusion or significant stenosis. Anastomoses here are often weak or absent, hence the marginal artery at this point (known as Griffiths point) is often focally small or discontinuous.

What does the marginal artery supply in gut?

The marginal artery, also known as the artery of Drummond, supplies the proximal descending colon at the splenic flexure. The artery of Drummond is an arterial arcade formed by an anastomosis between the distal branches of the superior and inferior mesenteric arteries.

Is there such a thing as an arc of Riolan?

While we’re on the subject of anastomotic vascular arcs, there’s another eponymous and infamous arc in the human body… the Arc of Riolan. Some claim that Riolan did not clearly identify the artery and prefer the term “meandering mesenteric artery (of Moskowitz).” Some claim that the two are different arteries.

Where does the arc of Riolan and Drummond originate?

Marginal artery of Drummond and arc of Riolan (mnemonic) In comparison, although both originate from the inferior mesenteric artery (IMA) or its branches, the arc of Riolan runs p r oximally to the root of the mesentery. Hence, the marginal artery of D rummond runs D istally and the arc of R iolan p R oximally to the root of the mesentery.

How is the arc of Riolan related to the mesentery?

It is classically described as connecting the middle colic branch of the SMA with the left colic branch of the IMA. It forms a short loop that runs close to the root of the mesentery. When present, the arc of Riolan is an important connection between the SMA and IMA in the setting of arterial occlusion or significant stenosis.

Where does the arc of Riolan cross the pancreas?

Technique: The arc of Riolan is a vessel that crosses anterior to the inferior mesenteric vein horizontally below the level of the pancreas.