The major arteries in the body develop from the embryonic truncus arteriosus and a series of paired arch arteries. The ascending aorta and pulmonary trunk form from the truncus arteriosus, while the arch of the aorta and its branches develop from the ventral part of the aortic sac and arch arteries. As the arch arteries regress, the descending aorta, brachiocephalic artery, common and internal carotid arteries remain. The pulmonary artery and ductus arteriosus are derived from the sixth arch arteries. Developmental anomalies can occur if there are issues with the regression of the arch arteries or formation of the ductus arteriosus.
7. Summary
• Ascending aorta & pulmonary trunk
---truncus arteriosus
• Arch of aorta---ventral part of the aortic sac
& its left horn & the left 4th
arch artery
• Descending aorta—left dorsal aorta below
the attachment of 4th
artery, along with the
fused median vessels
• Brachicephalic art—right horn of the aortic
sac
8. • Common carotid art—part of the 3rd
aortic arch.
• Internal carotid art—portion of the 3rd
arch
artery distal to the bud, along with the original
dorsal aorta cranial of the 3rd
arch artery
• External carotid artery—arises as a bud from
the 3rd
arch artery
• Pulmonary artery—part of the 6th
arch arteries
lying between the pulmonary trunk & the
branches to the lung buds
9. • Ductus arteriosus—the part of the left 6th
arch artery, between the branch to the lung
bud & the aorta, forms the ductus arteriosus.
• Developmental anomalies
I. Double aortic arch
II.Right aortic arch
III.Interrupted aortic arch
IV.Coarctation of aorta
V.Patent ductus arteriosus
