What is the arc of Riolan?

The arc of Riolan (AOR), also known as the central anastomotic mesenteric artery or meandering mesenteric artery, is an inconstant artery which links the proximal superior mesenteric artery (SMA) or one of its principal branches to the proximal inferior mesenteric artery (IMA) or one of its primary branches [1].

What is the marginal artery?

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.

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 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).

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.

What is the marginal artery heart?

Right marginal artery (Arteria marginalis dextra) The right marginal artery is a branch of the right coronary artery. It supplies the majority of the myocardium of the right ventricle of the heart. Some authors refer to this artery as the acute marginal artery, or the right marginal branch of right coronary artery.

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.

Why is it called marginal artery?

The acute marginal artery is the longest branch of the right coronary artery on the anterior aspect of the heart and extends towards the cardiac apex. The name reflects the fact that this artery runs along the anteroinferior border of the heart called the “margo acutus” in Latin or the “acute margin”.

Where is the marginal artery?

colon
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 supplies the right marginal artery?

The right marginal branch of right coronary artery (or right marginal artery) is the largest marginal branch of the right coronary artery. It follows the acute margin of the heart. It supplies blood to both surfaces of the right ventricle….

Who is Jean and what is Riolan anastomosis?

Jean, French anatomist and botanist, 1577-1657. Riolan anastomosis – the specific portion of the marginal artery of the colon connecting the middle and left colic arteries. Synonym (s): Riolan arc (3)

What is the medical definition of the Riolan?

See: Riolan anastomosis, Riolan arc, Riolan arcades, Riolan bones, Riolan bouquet, Riolan muscle. Jean, French anatomist, 1577–1657. A vascular arch within the mesentery of the transverse colon. The two ligaments and three muscles attached to the styloid process of the temporal bone.

What are the Riolan bones in the colon?

Riolan anastomosis – the specific portion of the marginal artery of the colon connecting the middle and left colic arteries. Riolan bones – several small sutural bones sometimes present in the petrooccipital suture.

Which is the best definition of anastomosis?

1. an anastomosis connecting the end of an artery and that of some other vessel, either directly or with a synthetic graft. 2. anastomosis of two sections of colon, such as with partial colectomy or when an ileostomy is closed.