QS Study

Ligamentum Arteriosum

The remnant of ductus arteriosus is called the Ligamentum Arteriosum. It is a small ligament that is the remnant of the ductus arteriosus formed within three weeks after birth. It is a cord of tissue that connects the pulmonary trunk and the aorta and that is the vestige of the ductus arteriosus. The majority part of this tissue is draped over the last region of the arch of aorta called the isthmus of the aorta.

Before birth: (in foetal life)

It provides a route of aortic blood to pass into the lungs through the pulmonary veins, to supply pure (oxygenated) blood, as because in this period lungs remain inactive.

In an adult, in the form of ligamentum arteriosum, it only connects the two structures.

Fig: Ligamentum Arteriosum


The main function of ligamentum arteriosum is crucial on the birth of a baby. During birth, the baby will initiate to breathe on his own thus opening the pulmonary artery and letting the blood enter the lungs. It plays an important function in particular heart abnormalities aids in controlling the aortic arch helpful on the dissimilar steps of a cardiac cycle.

This ligament also plays a role in major trauma; it fixes the aorta in place during rapid decelerations recoil, consequently potentially resulting in a ruptured aorta.

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