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ANAT 1625 Embryology of the Heart

ANAT 1625 Embryology of the Heart - the dorsal aortae The...

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Embryology of the Heart. The cardiovascular system in one of the first body systems to develop, in order to carry oxygen and nutrients around the embryo. The Heart tube develops from unsegmented mesoderm at the rostral end of the embryo, and during longitudinal and lateral folding it is carried round to its future thoracic position, within the future pericardial cavity. The tube undergoes separation separating the atria, ventricles, and great vessels. Atrial separation involves the develop of two septa. The septa primum, and septa secundum. The divisions of the truncus arteriosus is accomplished by the appearance of the spiral aortico-pulminary septum, which separates the pulmonary trunk from the ascending aorta. The arterial system develops as two dorsal aortae which fuse after the arch, just caudal to the heart. The truncus arteriosus gives rise initially to five/six pairs of aortic arches, which feed into
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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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