![]() Right arch forms the right pulmonary artery Left arch forms part of the arch of the aortaĮither never forms, or forms incompletely and regresses Right arch forms the right subclavian artery The derivatives of the aortic arches in the adult are as follows: 1 st archĬontributes to the maxillary, hyoid and stapedial arteries.įorms the common carotid artery and part of the proximal internal carotid artery. The early arterial system begins as a bilaterally symmetrical system of arched vessels, which then undergo extensive remodeling to create the major arteries that exit the heart. This process produces a shape that is much closer to the fully developed heart. ![]() The bulbus cordis moves ventrally, caudally, and to the right (forward, down and right), and the caudal portion – the primitive ventricle – moves dorsally, cranially and to the left (backwards, up and left). The heart tube continues to elongate, and begins looping at around day 23 of development. ![]() Initially, the heart tube is suspended within the pericardial cavity by a membrane this subsequently degenerates to allow for further growth.įrom superior to inferior, the primitive heart tube is comprised of six regions: The development of the heart begins with the formation of the primitive heart tube following the folding of the embryo during the end of the third week.įirstly, lateral folding creates the heart tube by bringing together two precursor regions, then cephalocaudal folding positions the heart tube in the future thorax. ![]()
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