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Related to atrioventricular sulcus: atrioventricular groove, Coronary groove
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In the second case, the right coronary artery was originating from the left aortic sinus from its mid portion and emerged on the sternocostal surface by passing between ascending aorta and pulmonary trunk, reached the atrioventricular sulcus and had a normal course thereafter.
The sulcal branch passed to the left in the posterior atrioventricular sulcus and might anastomose with the sulcal branch of the circumflex artery (CX).
The postero-inferior fibers course underneath the fibers that surround the orifice of the inferior vena cava and are attenuated along the external side of the right atrium at the level of the right atrioventricular sulcus in close relationship to the inferior fibers of the crista terminalis, at the cavo-tricuspid isthmus.
The right inferior ostium was the origin of the right coronary artery, which alone had a normal course, coursing in the right atrioventricular sulcus and terminating in the posterior descending artery.
At the level of the A-V sulcus, the anterior surface of the CS is separated from the atrial and ventricular myocardium by connective and adipose tissue, precluding it from an intramural location in the atrioventricular sulcus.
It is located anterolateral^ and lies in the left atrioventricular sulcus, superior to the proximal portion of the left circumflex artery (1).
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