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. 2005 Sep;91(9):1240–1245. doi: 10.1136/hrt.2004.057299

Figure 4.

Figure 4

 Origin of the left main coronary artery (LMCA) from the right sinus of Valsalva. Top left: the LMCA passes between the aorta and pulmonary trunk, posteriorly and adjacent to the pulmonary trunk. Top right: the LMCA passes anteriorly over the right ventricular outflow tract. Bottom left: the LMCA may course along the crista supraventricularis intramyocardially or subendocardially, surfacing in the proximal interventricular sulcus. Bottom right: the LMCA may rise to the right of the right coronary artery and pass posteriorly to the aortic root.