What is the aortic isthmus?
what happens to it in a normal babe-in-arms after birth? does it become the aortic arch?
Answers:
The aortic isthmus is part of the aortic arch. You are perhaps confusing it with the ductus arteriosus, which is a blood vessel running contained by the foetus from the pulmonary artery to the aorta. The blood in the ductus arteriosus bypasses the lungs (which do nothing useful surrounded by the foetus), but after the birth the ductus normally closes and the blood flows in the proper direction through the lungs. The isthmus is that slightly narrowed section of the aorta between the not here subclavian artery, which goes down the left arm, and the entry point of the ductus arteriosus. Source(s): Gray's anatomy
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Answers:
The aortic isthmus is part of the aortic arch. You are perhaps confusing it with the ductus arteriosus, which is a blood vessel running contained by the foetus from the pulmonary artery to the aorta. The blood in the ductus arteriosus bypasses the lungs (which do nothing useful surrounded by the foetus), but after the birth the ductus normally closes and the blood flows in the proper direction through the lungs. The isthmus is that slightly narrowed section of the aorta between the not here subclavian artery, which goes down the left arm, and the entry point of the ductus arteriosus. Source(s): Gray's anatomy
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