Right marginal artery
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.
The right marginal artery gives off several collateral branches to supply the adjacent surfaces of the right ventricle. It terminates by anastomosing with the branches of the anterior interventricular artery.
This article will discuss the anatomy and function of the right marginal artery.
|Source||Right coronary artery (RCA)|
|Branches||Unnamed collateral branches for the right ventricle|
|Supply||Right margin of heart, anterior and inferior surfaces of right ventricle|
Origin and course
The right marginal artery originates from the right coronary artery at the inferior (acute) margin of the heart, as one of its largest branches. It courses along the inferior margin towards the apex of the heart, being followed by the right marginal vein. Sometimes the origin of the artery is located more proximally on the trunk of the right coronary artery. In this case, the artery descends obliquely downward over the anterior surface of the right ventricle.
The right marginal artery shares its supply territory with the anterior and posterior interventricular (IV) branches of the right coronary artery. For this reason, its size and length are inversely proportional to that of the IV branches. If the IV branches are poorly developed, then the right marginal artery usually reaches the apex of the heart where it anastomoses with the collateral branches of the anterior interventricular artery, a branch of the left coronary artery.
Branches and supply
The right marginal artery gives off several collateral branches along its course that directly supply the surrounding myocardium. The supply territory of the right marginal artery is the right margin of the heart and the anterior and inferior surfaces of the right ventricle.
Learn everything about the coronary arteries and blood supply to the heart with our articles, video tutorial, quizzes and labeled diagrams: