If circumflex aery gives the posterior interventricular branch, this circulation is described as aEUR'
Left dominance Dominance of the coronary aerial system depends on which aery gives rise to the posterior interventricular branch (posterior descending aery). This branch supplies adjacent areas of both ventricles and posterior third of the IV septum.Right dominance: In this more conzmon type the posterior interventricular aery is a brute of . coronary aery. Seen in 67 to 90% of the population (67% according to Moore's 5/e and 90% according to Snell's 6/e and BDC 4/e, and some middle values on internet)Left dominance: The circumflex aery, the continuation of left coronary provides the post. IV branch (Seen in 10 to 15%)Codominance/balanced: Branches of both right and left coronary aery run in or near the sulcus.Note that the term 'Right dominance' is misleading, since the left aery almost always supplies a greater volume of tissue.
Right dominance
Left dominance
Codominance
Undetermined