What structures form the ductal arch?

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Multiple Choice

What structures form the ductal arch?

In fetal circulation the ductal arch is formed by a connection between the left pulmonary artery and the descending aorta through the ductus arteriosus. The curved path you see on ultrasound runs from the left pulmonary artery, through the ductus arteriosus, and into the descending aorta. This arrangement is why the structures forming the ductal arch are the descending aorta, the ductus arteriosus, and the left pulmonary artery. The ductus arteriosus itself arises from the left sixth aortic arch, which explains its left-sided course. The other options don’t fit because they either involve vessels or chambers not part of this curved connection: the ascending aorta or right pulmonary artery aren’t the components of the ductal arch, and the ventricles are pumping chambers rather than the vessels that form the arch.

In fetal circulation the ductal arch is formed by a connection between the left pulmonary artery and the descending aorta through the ductus arteriosus. The curved path you see on ultrasound runs from the left pulmonary artery, through the ductus arteriosus, and into the descending aorta. This arrangement is why the structures forming the ductal arch are the descending aorta, the ductus arteriosus, and the left pulmonary artery. The ductus arteriosus itself arises from the left sixth aortic arch, which explains its left-sided course.

The other options don’t fit because they either involve vessels or chambers not part of this curved connection: the ascending aorta or right pulmonary artery aren’t the components of the ductal arch, and the ventricles are pumping chambers rather than the vessels that form the arch.

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