Dsh

Septum primum

Pulmonary vein

Septum primum

Ostium primum

Interventricular foramen

Septum secundum

— Ostium secundum

Endocardial cushions fused

Pulmonary vein

Endocardial cushion

Venous valves

Septum primum

Interventricular foramen

Septum secundum

Ostia Insects Picture

Figure 11.14 Atrial septa at various stages of development. A. 30 days (6 mm).

B. Same stage as A, viewed from the right. C. 33 days (9 mm). D. Same stage as

C, viewed from the right E. 37 days (14 mm). F. Newborn. G. The atrial septum from the right; same stage as F.

Superior vena cava Septum Valve of secundum oval foramen

Superior vena cava Septum Valve of secundum oval foramen

Valve of coronary sinus

Valve of inferior vena cava

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