Sinus Venosus Development

Left ventricle

Left sinus horn

Left Horn Sinus Venosus

Right sinus horn

Inferior vena cava

Right ventricle

35 days

Figure 11.10 Dorsal view of two stages in the development of the sinus venosus at approximately 24 days (A) and 35 days (B). Broken line, the entrance of the sinus venosus into the atrial cavity. Each drawing is accompanied by a scheme to show in transverse section the great veins and their relation to the atrial cavity. ACV, anterior cardinal vein; PCV, posterior cardinal vein; UV, umbilical vein; VIT V, vitelline vein; CCV, common cardinal vein. (See also Fig. 11.41.)

Inferior vena cava

Right ventricle

35 days

Figure 11.10 Dorsal view of two stages in the development of the sinus venosus at approximately 24 days (A) and 35 days (B). Broken line, the entrance of the sinus venosus into the atrial cavity. Each drawing is accompanied by a scheme to show in transverse section the great veins and their relation to the atrial cavity. ACV, anterior cardinal vein; PCV, posterior cardinal vein; UV, umbilical vein; VIT V, vitelline vein; CCV, common cardinal vein. (See also Fig. 11.41.)

Oblique vein of left atrium

Oblique vein of left atrium

Coronary sinus

Pulmonary artery

Oblique vein of left atrium

Aorta i

Superior vena cava

Pulmonary

Pulmonary artery

Oblique vein of left atrium

Aorta i

Pulmonary

Oblique Vein Left Atrium
Inferior vena cava

Coronary sinus

Figure 11.11 Final stage in development of the sinus venosus and great veins.

Interseptovalvular space

Septum spurium

Right venousi valve

Sinuatrial orifice

Left venous

Septum primum

Septum primum

Interseptovalvular space

Septum spurium

Right venousi valve

Sinuatrial orifice

Left venous

Septum Primum

Inferior endocardial C cushion

Pulmonary Sinus veins venarum Crista terminalis

Valve of inferior vena cava

Superior vena cava

Septum Septum secundum . primum

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