In most other cases the nerve (relative to its associated artery and vein) would be the deepest or more medial followed by the artery and then the vein But in this case it is the opposite This must be remembered when venous or arterial samples are required from the femoral vesselsThe right and left coronary veins drain into the coronary sinus, which empties into the right atrium Tributaries of the coronary sinus include the great cardiac vein, which drains the left atrium and both ventricles into the coronary sinusOn either side, the arteries are posteriorly related to the sympathetic trunk, diaphragm, and adjacent pleura The subcostal artery accompanies the subcostal vein and nerve in the subcostal space The trio enters the abdomen as it passes by the lateral (external) arcuate ligament of the diaphragm, quadratus lumborum and the kidney
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