Skip to main content
Insights into Imaging
Fig. 2 | Insights into Imaging

Fig. 2

From: Computed Tomography and Magnetic Resonance Imaging of the Coronary Sinus: Anatomic Variants and Congenital Anomalies

Fig. 2

Development of the CS at 4 weeks (a), 7 weeks (b) and 8 weeks (c) of gestation. The sinus venosus receives three paired sets of veins. At 7 weeks, there is atrophy of the umbilical veins and the left vitelline vein (grey vessels). An oblique bridging channel forms between the left and right anterior cardinal veins, which shifts systemic venous return to the right SVC and into the right atrium. At 8 weeks, there is atrophy of the left anterior cardinal vein. The left horn of the sinus venosus develops into the CS, while the right horn becomes incorporated into the wall of the right atrium (as the sinus venarum). ACV, anterior cardinal vein; PCV, posterior cardinal vein; UV, umbilical vein; VV, vitelline vein; SVC, superior vena cava; IVC, inferior vena cava; LA, left atrium; RA, right atrium

Back to article page