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Anatomy of the coronary circulation
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Along the way, it gives off the right marginal branch, which gets close to the apex, but doesn’t reach it and supplies the right border of the heart.
After giving this branch, the RCA turns to the left and continues its journey in the coronary sulcus posteriorly.
The RCA usually gives the posterior interventricular branch which descends in the posterior interventricular groove.
This branch supplies areas of both ventricles and sends perforating interventricular septal branches into the IV septum.
Finally, the terminal branch of the RCA continues for a short distance in the coronary sulcus.
At the superior end of the anterior interventricular or IV groove, the LCA divides into two branches: the anterior interventricular or IV branch, sometimes called the left anterior descending or LAD and the circumflex branch.
The anterior IV branch passes through the anterior IV groove to the apex, where it turns around the inferior border of the heart and typically anastomoses with the posterior IV branch of the RCA.
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