Table 3

Defining characteristics of the cardiac chambers

Structure Characteristic appearance
Right atriumSystemic venous connections
Wide necked, blunt appendage
Left atriumNarrow necked, hook like appendage
Right ventricleTricuspid valve offset apically
Chordal attachments to the ventricular septum
Triangular shape with separate inflow/body/outflow
Moderator band
Trabeculated endocardial surface
Left ventricleMitral valve offset basally
Two papillary muscles—no chordal insertion to septum
Ellipsoid shape with adjacent inflow and outflow tracts