The so-called ligamentum arteriosum is innervated.

The ductus arteriosus is a muscular artery connecting the pulmonary trunk directly to the aorta in fetal circulation in order to by-pass the fluid filled lungs. Post-natally, this vessel is speculated to undergo obliteration, fibrosis and ultimately metamorphosize into a band of ligament, thereby changing name from the ductus arteriosus to the ligamentum arteriosum (LA). Earlier studies into the innervation of the ductus arteriosus reported innervation from the left aortic and vagus nerves.