True regarding coronary circulation is
C i.e. Left aery supplies more tissue in right dominance Right coronary aery arise from anterior aoic sinus, has lesser diameter (than LCA), supplies major pa of right ventricle & right atriumQ. RCA gives rise to acute marginal, right conus (infundibular), posterior interventricular /descending (in most 67-90% cases and these are k/a right dominant), and nodal aery (in 65% cases). Whereas Left coronary aery (LCA) gives rise to Circumflex Coronary, Obtuse marginal, left diagonal, and anterior interventricular(descending) aery. (Mn-"COLA or COLDArin")A single (not 3) marginal aery arise from left circumflex aery QIn 'right dominance' the posterior interventricular (descending) aery is derived from right coronary aery (67%)Q;in left dominance' it is a branch of circumflex, branch of left coronary aery. (15%)Q. In a 'Co- dominant or balanced' pattern, branches of both left & right coronary aery run in or near the posterior interventricular groove (18%).Term dominance is misleading as the left aery almost always supplies a greater volume myocardiumQ.Occlusion of anterior descending branch of LAD will cause infarction of anterior wall of left ventricleQ
Dominance affects anterior surface
Most are left dominant
Left aery supplies more tissue in right dominance
Dominance is dependent on nodal and marginal aery