The Anatomic Basis of Connections Between the Coronary Sinus Musculature and the Left Atrium in Humans

Background —This study determined the histological features of the atrial myocardium connecting the coronary sinus and the left atrium in humans. Methods and Results —Ten necropsied hearts were studied by performing serial longitudinal sections parallel to the long axis of the coronary sinus that extended its full length using a large microtome. In all specimens, the venous wall of the coronary sinus was surrounded by a cuff of striated muscle...