“…The black asterisk shows the place of the ventral septal attachment of the right muscular atrioventricular valve. Adapted and modified from Prosheva & Kaseva (). (C) Photograph of the ventricular surface of the right muscular atrioventricular valve; Ao, aorta; af, annulus fibrosus; cs, coronary sinus; ivs, interventricular septum; la, left atrium; ravv, right muscular atrioventricular valve; ra, right atrium; rv, right ventricle; a, part of the free edge of the valve, attached to the right ventricle free wall; b, area of the valve junction with the ventral side of the interventricular septum; c, base of the valve; d, area of the valve junction with the dorsal side of the interventricular septum; e, free edge of the valve.…”