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The aortic sac or aortic bulb [1] is a dilated structure in mammalian embryos, lined by endothelial cells and is the most distal part of the truncus arteriosus. [2] It is the primordial vascular channel from which the aortic arches arise (and eventually the dorsal aortae ) and is homologous to the ventral aorta of gill-bearing vertebrates.
The aortic arches or pharyngeal arch arteries (previously referred to as branchial arches in human embryos) are a series of six paired embryological vascular structures which give rise to the great arteries of the neck and head. They are ventral to the dorsal aorta and arise from the aortic sac.
The truncus arteriosus and bulbus cordis are divided by the aorticopulmonary septum.The truncus arteriosus gives rise to the ascending aorta and the pulmonary trunk.The caudal end of the bulbus cordis gives rise to the smooth parts (outflow tract) of the left and right ventricles (aortic vestibule & conus arteriosus respectively). [2]
The aortic sac is the embryological precursor of the proximal portion of the aortic arch. It is chronologically the first portion of the aorta to form, and appears as a dilation superior to the truncus arteriosus. Between the two horns of aortic sac, right horn gives rise to the brachiocephalic artery.
The aortic arch, arch of the aorta, or transverse aortic arch (English: / eɪ ˈ ɔːr t ɪ k / [1] [2]) is the part of the aorta between the ascending and descending aorta. The arch travels backward, so that it ultimately runs to the left of the trachea .
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In the developing heart, the truncus arteriosus and bulbus cordis are divided by the aortic septum.This makes its appearance in three portions. Two distal ridge-like thickenings project into the lumen of the tube; these increase in size, and ultimately meet and fuse to form a septum, which takes a spiral course toward the proximal end of the truncus arteriosus.
Days later, on the Livingston's cul-de-sac, the grief was still fresh to 13-year-old Helen Li, who played with Alydia and Everly on the rare occasions they weren't training or competing. To her ...
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262 Neil Avenue # 430, Columbus, Ohio · Directions · (614) 221-7464