Table 1

Morphological features of chambers and great arteries

Atriums
Morphologically right
• triangular, broad based appendage• terminal crest
• extensive pectinate muscles• rim around oval fossa
Morphologically left
• tubular, narrow based appendage• no terminal crest
• limited pectinate muscles• valve of oval fossa
Ventricles
Morphologically right
• coarse apical trabeculations• moderator band
• leaflet of AV valve attached directly to septum (septal leaflet of TV)• septomarginal trabeculation
Morphologically left
• fine apical trabeculations
• smooth upper part of septum (without attachment of mitral valve)
Morphologically indeterminate
• very coarse trabeculations• no ventricular septum (solitary ventricle)
Great arteries
Aorta
• origin of coronary arteries
• aortic arch, usually with three arch arteries
Pulmonary trunk
• bifurcates into right and left pulmonary arteries
Common arterial trunk (all three components mentioned below are present)
• origin of coronary arteries
• origin of aortic arch and arch arteries
• origin of pulmonary trunk or pulmonary arteries
Solitary arterial trunk
• origin of coronary arteries
• origin of aortic arch and arch arteries
• collateral arteries supply lungs