What anatomical structures form from the ductus arteriosus?

The ductus arteriosus is a vital fetal blood vessel that connects the pulmonary artery to the aorta. During fetal development, this connection allows blood to bypass the non-functioning lungs, as the fetus receives oxygen from the placenta. After birth, the ductus arteriosus typically closes and forms the ligamentum arteriosum.

The correct answer highlights that the ductus arteriosus connects two significant anatomical structures: the aorta and the pulmonary arteries. This connection is crucial for fetal circulation, as it redirects blood flow from the right ventricle directly into the aorta, thus avoiding the lungs. Understanding this relationship is beneficial, as it provides insight into both normal fetal circulation and the changes that occur after birth.

The other options do not accurately represent structures formed from the ductus arteriosus, as they mention structures that either do not connect to the ductus arteriosus or are not involved in the same circulatory function during the fetal period.