Unformatted text preview: the dorsal aortae. The symmetry of this pattern is lost as the adult pattern of the arches develops. The veins of the embryo drain into the sinus venosus, which also loses its initially symmetric pattern. Draining respectfully the placenta and yolk sac. The body of the embryo is drained via the anterior and posterior cardinal veins, via the common cardinal vein into the sinus venosus. After birth changes occur in the morphology and organization if the cardiovascular system as a result of lung breathing. Thus the imbilical arteries become the medial umbilical ligaments, the left umbilical vein becomes the ligamintum teres hepatis, the ductus venosus becomes the ligamuntum venosum and the ductus arteriosum becomes the ligamuntum arteriosum. The foramen ovale between the two atria closes leaving the fossa ovalis in the interatrial septa....
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- Winter '11
- Embryology, sinus venosus, truncus arteriosus, dorsal aortae