Left (obtuse) Marginal Artery
Right (acute) Marginal Artery
The marginal arteries are branches of the left and right coronary arteries.
The Right (acute) Marginal artery arises from the right coronary. The right marginal artery passes toward the apex along the right (acute) margin of the heart and ramifies over the right ventricle.
The Left (obtuse) Marginal artery arises from the circumflex branch of the left coronary artery. The left marginal artery follows the left (obtuse) margin of the heart supplying the left ventricle.
The Diagonal Branches are typically three or four lateral branches of the anterior interventricular artery which supply the left ventricle.