Karnataka PGET Medicine MCQ Answer 14

• left and right coronary aa. come off aorta just above valve
• both run in interventricular sulci, left in anterior, right in posterior
• 80% of people are RCA (right coronary a.) dominant

• supplies: RV, post LV, RA, 1/3 IVS, both nodes
• runs along coronary groove (between RA and RV), gives off right marginal branch at inferior border, then turns to posterior part and gives off largest branch the posterior interventricular branch
• opposite the origin of the PIV, atrioventricular nodal a. is usually given off which supplies AV node and bundle

• supplies: LV, LA, ant. 2/3 IVS
• divides into two terminal branches (anterior interventricular branch, circumflex branch) soon after entering coronary groove
• anterior interventricular branch (a.k.a. LAD), passes along ant. interventricular groove to apex of the heart where it turns and anastomoses with the posterior interventricular branch
• circumflex branch follows coronary groove around left border to posterior surface, terminates by giving off branches to LV and LA
• marginal branch of circumflex follows left border

Category: Karnataka PGET 2007 MCQs