SA nodal branch

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The sinoatrial nodal artery is the second branch that arises from the proximal RCA in 65.4%, immediately distal to the RCA origin.
In 16.6% of cases, the sinoatrial nodal artery arises from the LCX

Left) SA nodal branch arising from RCA coursing between right atrium and aortic root (65.4%)
Right) SA nodal branch arising from LCX (16.6%)

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