Fig. 2. Histological sections showing morphology of the normal neonatal mouse
heart. (A) Low magnification view of the anterior portion of the heart,
showing the normal configuration of the interventricular septum (IVS) and
ventricular walls. Note the relative thickness of these components. (B,C) The
right ventricular (RV) subpulmonary outflow tract (PA) is shown in B, whereas
C illustrates the left ventricular (LV) outflow tract (Ao). Note the fibrous
continuity of the mitroaortic valves. (D-F) Configuration of structures in the
venous pole of the heart. The sequence of sections shows normal connection of
the left superior vena cava (LSVC) to the right atrium (RA) via the coronary
sinus (CS). Also shown are the right superior vena cava (RSVC) connection to
the right atrium (RA; D,E) and the atrial septal complex. Same magnification
used in panels B-F. MV, mitral valve; TV, tricuspid valve; FO, foramen ovale;
FS, foramen secundum.