31-08-2016, 10:59 AM
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1.it first passes forwards and and to the right to emerge on the surface of the heart between the root of the pulmonary trunk and right auricle.
2.it runs downwards in the right anterior coronary sulcus to the junction of the right and the inferior borders of the heart,
3.it winds around the inferior border to reach the diaphragmatic surface of the heart.here it runs backwards and to the left in the right posterior interventricular groove.
4..it terminates by anstomosing with the circumflex branch oh the left coronary rtey at the crux.
*.BRANCHES.
1.large branches;-marginal and posterior interventricular.
2.small branches;-nodal in 60% of cases,right atrial.infundibulum,terminal,right centricular,conus.
*AREA OF DISTRIBUTION;-
1.right atrium
2.ventricles
a).greater part of the right ventricle,except the area adjoining the anterior interventricular groove.
b).a small part of the right ventricl adjoining the posterior interventricular groove,
3.posterior part on the interventricular septum.
4.whole of the conducting system of the heart except a part of the left branch of the AV bundle,the SA node is supplied by the left coronary artery is about 40% of cases.