The ductus arteriosus after birth becomes which structure?

Prepare for the Fetal Echocardiography Test. Utilize flashcards and multiple-choice questions that come with hints and explanations. Ace your exam preparation!

After birth, the ductus arteriosus normally closes as the lungs take over oxygenation and the circulation shifts from fetal to neonatal patterns. Oxygen rising in the blood and falling levels of prostaglandins trigger smooth muscle in the ductus to constrict, leading to functional closure within hours and eventual remodeling into fibrous tissue over days to weeks. The resulting remnant is a short fibrous cord known as the ligamentum arteriosum, which connects the proximal left pulmonary artery to the aorta. This is why the ductus arteriosus becomes the ligamentum arteriosum. Other fetal shunts leave different remnants: the ductus venosus becomes the ligamentum venosum, the foramen ovale becomes the fossa ovalis, and the umbilical vein becomes the ligamentum teres.