the location and course of the atrioventricular ( av ) conduction system were studied histopathologically in 6 hearts by sectioning serially , 4 having common av orifice ( cavo ) with complete or partial transposition of the great arteries ( tga ) and 2 having ventricular septal defect of the persistent common av canal type ( vsd-c ) with complete tga .
C0018787
hearts
C0018818
vsd